v3.23.3
Portfolio Investments - Portfolio Listing (Details)
€ in Thousands, £ in Thousands, $ in Thousands
Sep. 30, 2023
USD ($)
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Sep. 30, 2023
EUR (€)
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Sep. 30, 2023
GBP (£)
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Sep. 30, 2022
USD ($)
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Sep. 30, 2022
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Sep. 30, 2022
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Sep. 30, 2021
USD ($)
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, at cost $ 3,044,119     $ 2,617,754      
Investments at fair value 2,892,420     2,494,111      
SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal 332,637     383,194      
Investment owned, at cost 331,808     382,673      
Investments at fair value 322,179     359,625      
OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal 130,589     143,225      
Investment owned, at cost 127,788     140,083      
Investments at fair value $ 123,343     $ 133,144      
Investment, Identifier [Axis]: 107 Fair Street LLC, Real Estate Development, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[3],[4],[5],[6] 12.50% 12.50% 12.50%        
Investment, principal [1],[3],[4],[6],[7] $ 1,269            
Investment owned, at cost [1],[3],[4],[6] 1,240            
Investments at fair value [1],[3],[4],[6] $ 1,214            
Investment, Identifier [Axis]: 107-109 Beech OAK22 LLC, Real Estate Development, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[3],[4],[5] 11.00% 11.00% 11.00%        
Investment, principal [1],[3],[4],[7] $ 18,869            
Investment owned, at cost [1],[3],[4] 18,687            
Investments at fair value [1],[3],[4] $ 18,443            
Investment, Identifier [Axis]: 109 Montgomery Owner LLC, Real Estate Operating Companies, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11]       9.80% 9.80% 9.80%  
Investment, principal [8],[9],[10],[12]       $ 389      
Investment owned, at cost [8],[9],[10]       387      
Investments at fair value [8],[9],[10]       $ 727      
Investment, Identifier [Axis]: 109 Montgomery Owner LLC, Real Estate Operating Companies, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       7.00% 7.00% 7.00%  
Investment, principal [8],[9],[10],[12],[13]       $ 0      
Investment owned, at cost [8],[9],[10],[13]       (31)      
Investments at fair value [8],[9],[10],[13]       0      
Investment, Identifier [Axis]: 112-126 Van Houten Real22 LLC, Real Estate Development, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[3],[4],[5],[6] 12.00% 12.00% 12.00%        
Investment, principal [1],[3],[4],[6],[7] $ 4,070            
Investment owned, at cost [1],[3],[4],[6] 4,038            
Investments at fair value [1],[3],[4],[6] $ 4,022            
Investment, Identifier [Axis]: A.T. Holdings II Ltd., Biotechnology, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14],[15] 14.25% 14.25% 14.25%        
Investment, principal [1],[4],[7],[14],[15] $ 21,434            
Investment owned, at cost [1],[4],[14],[15] 21,612            
Investments at fair value [1],[4],[14],[15] 21,220            
Investment, Identifier [Axis]: A.T. Holdings II SÀRL, Biotechnology, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal 6,021 [1],[4],[7],[14]     33,997 [8],[9],[12],[16]      
Investment owned, at cost 6,013 [1],[4],[14]     33,960 [8],[9],[16]      
Investments at fair value $ 5,900 [1],[4],[14]     $ 34,891 [8],[9],[16]      
Investment, Identifier [Axis]: ADB Companies, LLC, Construction & Engineering, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.25% 6.25% 6.25%  
Investment, interest rate [8],[9],[10],[11]       9.80% 9.80% 9.80%  
Investment, principal [8],[9],[10],[12]       $ 14,685      
Investment owned, at cost [8],[9],[10]       14,217      
Investments at fair value [8],[9],[10]       $ 14,431      
Investment, Identifier [Axis]: ADB Companies, LLC, Construction & Engineering, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 11.90% 11.90% 11.90%        
Investment, principal [1],[4],[5],[7] $ 3,446            
Investment owned, at cost [1],[4],[5] 3,411            
Investments at fair value [1],[4],[5] $ 3,383            
Investment, Identifier [Axis]: ADB Companies, LLC, Construction & Engineering, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 12.15% 12.15% 12.15%        
Investment, principal [1],[4],[5],[7] $ 17,901            
Investment owned, at cost [1],[4],[5] 17,743            
Investments at fair value [1],[4],[5] $ 17,575            
Investment, Identifier [Axis]: ADB Companies, LLC, Construction & Engineering, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 12.13% 12.13% 12.13%        
Investment, principal [1],[4],[5],[7] $ 963            
Investment owned, at cost [1],[4],[5] 948            
Investments at fair value [1],[4],[5] $ 945            
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.25% 6.25% 6.25%  
Investment, interest rate       9.80% 9.80% 9.80%  
Investment, principal       $ 8,518      
Investment owned, at cost       8,389      
Investments at fair value       $ 8,371      
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.25% 6.25% 6.25%  
Investment, interest rate       9.80% 9.80% 9.80%  
Investment, principal       $ 4,647      
Investment owned, at cost       4,579      
Investments at fair value       $ 4,567      
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 1 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% 6.50% 6.50%        
Investment, interest rate 11.90% 11.90% 11.90%        
Investment, principal $ 1,149            
Investment owned, at cost 1,135            
Investments at fair value $ 1,128            
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 1 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% 6.50% 6.50%        
Investment, interest rate 11.90% 11.90% 11.90%        
Investment, principal $ 574            
Investment owned, at cost 568            
Investments at fair value $ 564            
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 2 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% 6.50% 6.50%        
Investment, interest rate 12.15% 12.15% 12.15%        
Investment, principal $ 6,771            
Investment owned, at cost 6,701            
Investments at fair value $ 6,648            
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 2 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% 6.50% 6.50%        
Investment, interest rate 12.15% 12.15% 12.15%        
Investment, principal $ 3,746            
Investment owned, at cost 3,709            
Investments at fair value $ 3,678            
Investment, Identifier [Axis]: ADC Therapeutics SA, Biotechnology, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% [1],[4],[5],[14] 7.50% [1],[4],[5],[14] 7.50% [1],[4],[5],[14] 7.50% [8],[9],[10],[16] 7.50% [8],[9],[10],[16] 7.50% [8],[9],[10],[16]  
Investment, interest rate 13.04% [1],[2],[4],[5],[14] 13.04% [1],[2],[4],[5],[14] 13.04% [1],[2],[4],[5],[14] 11.20% [8],[9],[10],[11],[16] 11.20% [8],[9],[10],[11],[16] 11.20% [8],[9],[10],[11],[16]  
Investment, principal $ 6,589 [1],[4],[5],[7],[14]     $ 6,589 [8],[9],[10],[12],[16]      
Investment owned, at cost 6,305 [1],[4],[5],[14]     6,256 [8],[9],[10],[16]      
Investments at fair value $ 6,276 [1],[4],[5],[14]     $ 6,262 [8],[9],[10],[16]      
Investment, Identifier [Axis]: ADC Therapeutics SA, Biotechnology, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% [1],[3],[4],[14] 7.50% [1],[3],[4],[14] 7.50% [1],[3],[4],[14] 7.50% [8],[9],[10],[13],[16] 7.50% [8],[9],[10],[13],[16] 7.50% [8],[9],[10],[13],[16]  
Investment, principal $ 0 [1],[3],[4],[5],[7],[14]     $ 0 [8],[9],[10],[12],[13],[16]      
Investment owned, at cost (38) [1],[3],[4],[5],[14]     (38) [8],[9],[10],[13],[16]      
Investments at fair value $ (38) [1],[3],[4],[5],[14]     $ (37) [8],[9],[10],[13],[16]      
Investment, Identifier [Axis]: ADC Therapeutics SA, Biotechnology, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 28,948 [1],[4],[14] 28,948 [1],[4],[14] 28,948 [1],[4],[14] 28,948 [8],[9],[16] 28,948 [8],[9],[16] 28,948 [8],[9],[16]  
Investment owned, at cost $ 174 [1],[4],[14]     $ 174 [8],[9],[16]      
Investments at fair value $ 6 [1],[4],[14]     $ 73 [8],[9],[16]      
Investment, Identifier [Axis]: AI Sirona (Luxembourg) Acquisition S.a.r.l., Pharmaceuticals, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [4],[5],[14] 5.00% 5.00% 5.00%        
Investment, interest rate [2],[4],[5],[14] 8.86% 8.86% 8.86%        
Investment, principal | € [4],[5],[7],[14]   € 5,500          
Investment owned, at cost [4],[5],[14] $ 6,024            
Investments at fair value [4],[5],[14] $ 5,825            
Investment, Identifier [Axis]: AI Sirona (Luxembourg) Acquisition S.a.r.l., Pharmaceuticals, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[16]       7.25% 7.25% 7.25%  
Investment, interest rate [8],[9],[10],[11],[16]       7.94% 7.94% 7.94%  
Investment, principal | € [8],[9],[10],[12],[16]         € 24,838    
Investment owned, at cost [8],[9],[10],[16]       $ 27,752      
Investments at fair value [8],[9],[10],[16]       $ 22,143      
Investment, Identifier [Axis]: AIP RD Buyer Corp., Distributors, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 17,870 [1],[4] 17,870 [1],[4] 17,870 [1],[4] 14,410 [8],[9] 14,410 [8],[9] 14,410 [8],[9]  
Investment owned, at cost $ 1,733 [1],[4]     $ 1,352 [8],[9]      
Investments at fair value $ 2,826 [1],[4]     $ 1,291 [8],[9]      
Investment, Identifier [Axis]: AIP RD Buyer Corp., Distributors, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.75% [1],[4],[5] 7.75% [1],[4],[5] 7.75% [1],[4],[5] 7.75% [8],[9],[10] 7.75% [8],[9],[10] 7.75% [8],[9],[10]  
Investment, interest rate 13.17% [1],[2],[4],[5] 13.17% [1],[2],[4],[5] 13.17% [1],[2],[4],[5] 10.88% [8],[9],[10],[11] 10.88% [8],[9],[10],[11] 10.88% [8],[9],[10],[11]  
Investment, principal $ 17,873 [1],[4],[5],[7]     $ 14,414 [8],[9],[10],[12]      
Investment owned, at cost 17,655 [1],[4],[5]     14,154 [8],[9],[10]      
Investments at fair value $ 17,687 [1],[4],[5]     $ 13,910 [8],[9],[10]      
Investment, Identifier [Axis]: APX Group Inc., Electrical Components & Equipment, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11],[16]       5.75% 5.75% 5.75%  
Investment, principal [9],[12],[16]       $ 2,075      
Investment owned, at cost [9],[16]       1,733      
Investments at fair value [9],[16]       $ 1,645      
Investment, Identifier [Axis]: ASP Unifrax Holdings, Inc., Trading Companies & Distributors, Fixed Rate Bond 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11]       7.50% 7.50% 7.50%  
Investment, principal [9],[12]       $ 5,500      
Investment owned, at cost [9]       5,408      
Investments at fair value [9]       $ 3,641      
Investment, Identifier [Axis]: ASP Unifrax Holdings, Inc., Trading Companies & Distributors, Fixed Rate Bond 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11]       5.25% 5.25% 5.25%  
Investment, principal [9],[12]       $ 2,500      
Investment owned, at cost [9]       2,220      
Investments at fair value [9]       $ 1,926      
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Revolver | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Investment, principal $ 0            
Investment owned, at cost (7)     $ (9)      
Investments at fair value $ (29)     $ (11)      
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Revolver | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Investment, principal $ 0     $ 0      
Investment owned, at cost (3)     (4)      
Investments at fair value $ (12)     $ (5)      
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Investment, interest rate 11.63% 11.63% 11.63% 9.67% 9.67% 9.67%  
Investment, principal $ 4,134     $ 4,176      
Investment owned, at cost 4,076     4,103      
Investments at fair value $ 3,892     $ 4,080      
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Investment, interest rate 11.63% 11.63% 11.63% 9.67% 9.67% 9.67%  
Investment, principal $ 1,716     $ 1,734      
Investment owned, at cost 1,692     1,704      
Investments at fair value $ 1,616     $ 1,694      
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, Paper & Plastic Packaging Products & Materials, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5],[14] 6.00% 6.00% 6.00%        
Investment, principal [1],[3],[4],[5],[7],[14] $ 0            
Investment owned, at cost [1],[3],[4],[5],[14] (13)            
Investments at fair value [1],[3],[4],[5],[14] $ (23)            
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, Paper & Plastic Packaging Products & Materials, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[4],[5],[14] 11.63% 11.63% 11.63%        
Investment, principal [1],[4],[5],[7],[14] $ 3,276            
Investment owned, at cost [1],[4],[5],[14] 3,267            
Investments at fair value [1],[4],[5],[14] 3,084            
Investment, Identifier [Axis]: ATNX SPV, LLC, Pharmaceuticals, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [1],[4],[7],[14],[15] 12,222            
Investment owned, at cost [1],[4],[14],[15] 12,260            
Investments at fair value [1],[4],[14],[15] $ 11,795            
Investment, Identifier [Axis]: Access CIG, LLC | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00%        
Investment, interest rate 10.32% 10.32% 10.32%        
Investment, principal $ 2,000            
Investment owned, at cost 1,960            
Investments at fair value $ 1,978            
Investment, Identifier [Axis]: Access CIG, LLC, Diversified Support Services, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       7.75% 7.75% 7.75%  
Investment, interest rate [9],[10],[11]       10.82% 10.82% 10.82%  
Investment, principal [9],[10],[12]       $ 20,000      
Investment owned, at cost [9],[10]       19,927      
Investments at fair value [9],[10]       $ 19,075      
Investment, Identifier [Axis]: Access CIG, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 3.75% 3.75% 3.75%  
Investment, interest rate 10.32% 10.32% 10.32% 6.82% 6.82% 6.82%  
Investment, principal $ 8,596     $ 10,093      
Investment owned, at cost 8,503     10,028      
Investments at fair value $ 8,499     $ 9,692      
Investment, Identifier [Axis]: Accupac, Inc., Personal Care Products, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[3],[4],[5] 11.55% 11.55% 11.55%        
Investment, principal [1],[3],[4],[5],[7] $ 2,033            
Investment owned, at cost [1],[3],[4],[5] 2,013            
Investments at fair value [1],[3],[4],[5] $ 2,027            
Investment, Identifier [Axis]: Accupac, Inc., Personal Care Products, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[4],[5] 11.55% 11.55% 11.55%        
Investment, principal [1],[4],[5],[7] $ 20,234            
Investment owned, at cost [1],[4],[5] 20,150            
Investments at fair value [1],[4],[5] $ 20,194            
Investment, Identifier [Axis]: Accupac, Inc., Personal Care Products, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[3],[4],[5]        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (2)            
Investments at fair value [1],[3],[4],[5] $ (8)            
Investment, Identifier [Axis]: Accupac, Inc., Personal Products, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       5.50% 5.50% 5.50%  
Investment, interest rate [8],[9],[10],[11],[13]       9.14% 9.14% 9.14%  
Investment, principal [8],[9],[10],[12],[13]       $ 500      
Investment owned, at cost [8],[9],[10],[13]       462      
Investments at fair value [8],[9],[10],[13]       $ 495      
Investment, Identifier [Axis]: Accupac, Inc., Personal Products, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       5.50% 5.50% 5.50%  
Investment, interest rate [8],[9],[10],[11]       9.12% 9.12% 9.12%  
Investment, principal [8],[9],[10],[12]       $ 15,976      
Investment owned, at cost [8],[9],[10]       15,686      
Investments at fair value [8],[9],[10]       $ 15,944      
Investment, Identifier [Axis]: Accupac, Inc., Personal Products, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       5.50% 5.50% 5.50%  
Investment, principal [8],[9],[10],[12],[13]       $ 0      
Investment owned, at cost [8],[9],[10],[13]       0      
Investments at fair value [8],[9],[10],[13]       $ (6)      
Investment, Identifier [Axis]: Acquia Inc., Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[3],[4],[5] 7.00% [1],[3],[4],[5] 7.00% [1],[3],[4],[5] 7.00% [8],[9],[10],[13] 7.00% [8],[9],[10],[13] 7.00% [8],[9],[10],[13]  
Investment, interest rate 12.72% [1],[2],[3],[4],[5] 12.72% [1],[2],[3],[4],[5] 12.72% [1],[2],[3],[4],[5] 10.64% [8],[9],[10],[11],[13] 10.64% [8],[9],[10],[11],[13] 10.64% [8],[9],[10],[11],[13]  
Investment, principal $ 1,333 [1],[3],[4],[5],[7]     $ 914 [8],[9],[10],[12],[13]      
Investment owned, at cost 1,322 [1],[3],[4],[5]     890 [8],[9],[10],[13]      
Investments at fair value $ 1,324 [1],[3],[4],[5]     $ 898 [8],[9],[10],[13]      
Investment, Identifier [Axis]: Acquia Inc., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11]       9.63% 9.63% 9.63%  
Investment, principal [8],[9],[10],[12]       $ 27,349      
Investment owned, at cost [8],[9],[10]       27,038      
Investments at fair value [8],[9],[10]       $ 27,158      
Investment, Identifier [Axis]: Acquia Inc., Application Software, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5] 12.34% 12.34% 12.34%        
Investment, principal [1],[4],[5],[7] $ 6,400            
Investment owned, at cost [1],[4],[5] 6,335            
Investments at fair value [1],[4],[5] $ 6,380            
Investment, Identifier [Axis]: Acquia Inc., Application Software, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5] 12.34% 12.34% 12.34%        
Investment, principal [1],[4],[5],[7] $ 25,332            
Investment owned, at cost [1],[4],[5] 25,288            
Investments at fair value [1],[4],[5] $ 25,253            
Investment, Identifier [Axis]: Aden & Anais Merger Sub, Inc., Apparel, Accessories & Luxury Goods, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       51,645 51,645 51,645  
Investment owned, at cost [8],[9]       $ 5,165      
Investments at fair value [8],[9]       $ 0      
Investment, Identifier [Axis]: AirStrip Technologies, Inc., Application Software, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 5,715 [1],[4] 5,715 [1],[4] 5,715 [1],[4] 5,715 [8],[9] 5,715 [8],[9] 5,715 [8],[9]  
Investment owned, at cost $ 90 [1],[4]     $ 90 [8],[9]      
Investments at fair value $ 0 [1],[4]     $ 0 [8],[9]      
Investment, Identifier [Axis]: All Web Leads, Inc., Advertising, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.50% 8.50% 8.50%  
Investment, principal [8],[9],[10],[12]       $ 23,338      
Investment owned, at cost [8],[9],[10]       22,057      
Investments at fair value [8],[9],[10]       $ 22,141      
Investment, Identifier [Axis]: All Web Leads, Inc., First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[17] 8.50% 8.50% 8.50%        
Investment, principal [1],[4],[5],[7],[17] $ 23,562            
Investment owned, at cost [1],[4],[5],[17] 22,795            
Investments at fair value [1],[4],[5],[17] $ 9,797            
Investment, Identifier [Axis]: Altice France S.A., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%  
Investment, interest rate 9.63% 9.63% 9.63% 6.91% 6.91% 6.91%  
Investment, principal $ 2,969     $ 3,000      
Investment owned, at cost 2,853     2,841      
Investments at fair value $ 2,810     $ 2,730      
Investment, Identifier [Axis]: Altice France S.A., Integrated Telecommunication Services, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 5.50% [2],[4],[5],[14] 5.50% [2],[4],[5],[14] 5.50% [2],[4],[5],[14] 5.50% [9],[10],[11],[16] 5.50% [9],[10],[11],[16] 5.50% [9],[10],[11],[16]  
Investment, principal $ 4,050 [4],[7],[14]     $ 4,050 [9],[12],[16]      
Investment owned, at cost 3,577 [4],[14]     3,518 [9],[16]      
Investments at fair value $ 2,918 [4],[14]     $ 3,057 [9],[16]      
Investment, Identifier [Axis]: Alto Pharmacy Holdings, Inc., Health Care Technology, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 11.50% 11.50% 11.50%        
Investment, interest rate [1],[2],[4],[5] 5.00% 5.00% 5.00%        
Investment, principal [1],[4],[5],[7] $ 9,057            
Investment owned, at cost [1],[4],[5] 8,434            
Investments at fair value [1],[4],[5] $ 8,332            
Investment, Identifier [Axis]: Alto Pharmacy Holdings, Inc., Health Care Technology, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 598,283 598,283 598,283        
Investment owned, at cost [1],[4] $ 642            
Investments at fair value [1],[4] $ 1,915            
Investment, Identifier [Axis]: Alvogen Pharma Inc, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Investment, interest rate 13.04% 13.04% 13.04% 11.20% 11.20% 11.20%  
Investment, principal $ 6,230     $ 6,562      
Investment owned, at cost 6,185     6,489      
Investments at fair value $ 5,819     $ 6,529      
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Investment, interest rate 13.04% 13.04% 13.04% 11.20% 11.20% 11.20%  
Investment, principal $ 8,798     $ 9,267      
Investment owned, at cost 8,737     9,166      
Investments at fair value $ 8,218     $ 9,221      
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., Pharmaceuticals, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% [1],[4],[5] 7.50% [1],[4],[5] 7.50% [1],[4],[5] 7.50% [8],[9],[10] 7.50% [8],[9],[10] 7.50% [8],[9],[10]  
Investment, interest rate 13.04% [1],[2],[4],[5] 13.04% [1],[2],[4],[5] 13.04% [1],[2],[4],[5] 11.20% [8],[9],[10],[11] 11.20% [8],[9],[10],[11] 11.20% [8],[9],[10],[11]  
Investment, principal $ 17,053 [1],[4],[5],[7]     $ 13,134 [8],[9],[10],[12]      
Investment owned, at cost 16,982 [1],[4],[5]     12,847 [8],[9],[10]      
Investments at fair value $ 15,929 [1],[4],[5]     $ 13,068 [8],[9],[10]      
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, Fixed Rate Bond 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [8],[9],[10],[11],[16]       10.00% 10.00% 10.00%  
Investment, principal [8],[9],[12],[16]       $ 24,043      
Investment owned, at cost [8],[9],[16]       23,747      
Investments at fair value [8],[9],[16]       $ 23,923      
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, Common Stock 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 471,253 [4],[14] 471,253 [4],[14] 471,253 [4],[14] 587,930 [9],[16] 587,930 [9],[16] 587,930 [9],[16]  
Investment owned, at cost $ 849 [4],[14]     $ 5,308 [9],[16]      
Investments at fair value $ 4,298 [4],[14]     $ 3,974 [9],[16]      
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, Common Stock 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 141,640 [1],[4],[14],[18] 141,640 [1],[4],[14],[18] 141,640 [1],[4],[14],[18] 124,780 [8],[9],[16],[19] 124,780 [8],[9],[16],[19] 124,780 [8],[9],[16],[19]  
Investment owned, at cost $ 566 [1],[4],[14],[18]     $ 485 [8],[9],[16],[19]      
Investments at fair value $ 368 [1],[4],[14],[18]     $ 212 [8],[9],[16],[19]      
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, First Lien Fixed Rate Bond 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 8.50% 8.50% 8.50%        
Investment, principal [1],[4],[7],[14] $ 28,464            
Investment owned, at cost [1],[4],[14] 28,329            
Investments at fair value [1],[4],[14] $ 27,687            
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, First Lien Fixed Rate Bond 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 8.50% 8.50% 8.50%        
Investment, principal [1],[4],[7],[14] $ 2,121            
Investment owned, at cost [1],[4],[14] 1,945            
Investments at fair value [1],[4],[14] $ 2,063            
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, First Lien Fixed Rate Bond 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 8.50% 8.50% 8.50%        
Investment, principal [1],[4],[7],[14] $ 27,692            
Investment owned, at cost [1],[4],[14] 27,582            
Investments at fair value [1],[4],[14] $ 26,936            
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, First Lien Fixed Rate Bond 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 8.50% 8.50% 8.50%        
Investment, principal [1],[4],[7],[14] $ 2,064            
Investment owned, at cost [1],[4],[14] 1,891            
Investments at fair value [1],[4],[14] $ 2,007            
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, Fixed Rate Bond 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [8],[9],[10],[11],[16]       10.00% 10.00% 10.00%  
Investment, principal [8],[9],[12],[16]       $ 23,522      
Investment owned, at cost [8],[9],[16]       23,264      
Investments at fair value [8],[9],[16]       $ 23,404      
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Consumer Finance, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.75% [1],[4],[5] 8.75% [1],[4],[5] 8.75% [1],[4],[5] 8.75% [8],[9],[10] 8.75% [8],[9],[10] 8.75% [8],[9],[10]  
Investment, interest rate 14.14% [1],[2],[4],[5] 14.14% [1],[2],[4],[5] 14.14% [1],[2],[4],[5] 12.30% [8],[9],[10],[11] 12.30% [8],[9],[10],[11] 12.30% [8],[9],[10],[11]  
Investment, principal $ 17,048 [1],[4],[5],[7]     $ 14,760 [8],[9],[10],[12]      
Investment owned, at cost 16,440 [1],[4],[5]     14,492 [8],[9],[10]      
Investments at fair value $ 15,087 [1],[4],[5]     $ 13,284 [8],[9],[10]      
Investment, Identifier [Axis]: American Rock Salt Company LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.43% 9.43% 9.43%        
Investment, principal $ 4,957            
Investment owned, at cost 4,734            
Investments at fair value $ 4,614            
Investment, Identifier [Axis]: American Rock Salt Company LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.43% 9.43% 9.43%        
Investment, principal $ 2,478            
Investment owned, at cost 2,367            
Investments at fair value $ 2,307            
Investment, Identifier [Axis]: American Tire Distributors, Inc., Distributors, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.25% [4],[5] 6.25% [4],[5] 6.25% [4],[5] 6.25% [9],[10] 6.25% [9],[10] 6.25% [9],[10]  
Investment, interest rate 11.81% [2],[4],[5] 11.81% [2],[4],[5] 11.81% [2],[4],[5] 9.03% [9],[10],[11] 9.03% [9],[10],[11] 9.03% [9],[10],[11]  
Investment, principal $ 19,115 [4],[5],[7]     $ 9,895 [9],[10],[12]      
Investment owned, at cost 18,278 [4],[5]     9,772 [9],[10]      
Investments at fair value $ 16,798 [4],[5]     $ 9,293 [9],[10]      
Investment, Identifier [Axis]: American Tire Distributors, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Investment, interest rate 11.81% 11.81% 11.81% 9.03% 9.03% 9.03%  
Investment, principal $ 4,824     $ 4,873      
Investment owned, at cost 4,763     4,812      
Investments at fair value $ 4,239     $ 4,576      
Investment, Identifier [Axis]: American Tire Distributors, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Investment, interest rate 11.81% 11.81% 11.81% 9.03% 9.03% 9.03%  
Investment, principal $ 2,860     $ 2,889      
Investment owned, at cost 2,825     2,853      
Investments at fair value $ 2,514     $ 2,714      
Investment, Identifier [Axis]: Amplify Finco Pty Ltd., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.15% 4.15% 4.15% 4.25% 4.25% 4.25%  
Investment, interest rate 9.54% 9.54% 9.54% 7.92% 7.92% 7.92%  
Investment, principal $ 7,720     $ 7,800      
Investment owned, at cost 7,643     7,722      
Investments at fair value $ 7,720     $ 7,527      
Investment, Identifier [Axis]: Amplify Finco Pty Ltd., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.15% 4.15% 4.15% 4.25% 4.25% 4.25%  
Investment, interest rate 9.54% 9.54% 9.54% 7.92% 7.92% 7.92%  
Investment, principal $ 2,895     $ 2,925      
Investment owned, at cost 2,866     2,896      
Investments at fair value $ 2,895     $ 2,823      
Investment, Identifier [Axis]: Amplify Finco Pty Ltd., Movies & Entertainment, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[16]       4.25% 4.25% 4.25%  
Investment, interest rate [8],[9],[10],[11],[16]       7.92% 7.92% 7.92%  
Investment, principal [8],[9],[10],[12],[16]       $ 15,220      
Investment owned, at cost [8],[9],[10],[16]       13,973      
Investments at fair value [8],[9],[10],[16]       $ 14,687      
Investment, Identifier [Axis]: Amplify Finco Pty Ltd., Movies & Entertainment, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [1],[4],[5],[14] 8.00% [1],[4],[5],[14] 8.00% [1],[4],[5],[14] 8.00% [8],[9],[10],[16] 8.00% [8],[9],[10],[16] 8.00% [8],[9],[10],[16]  
Investment, interest rate 13.54% [1],[2],[4],[5],[14] 13.54% [1],[2],[4],[5],[14] 13.54% [1],[2],[4],[5],[14] 11.67% [8],[9],[10],[11],[16] 11.67% [8],[9],[10],[11],[16] 11.67% [8],[9],[10],[11],[16]  
Investment, principal $ 12,500 [1],[4],[5],[7],[14]     $ 12,500 [8],[9],[10],[12],[16]      
Investment owned, at cost 12,188 [1],[4],[5],[14]     12,188 [8],[9],[10],[16]      
Investments at fair value $ 11,865 [1],[4],[5],[14]     $ 11,958 [8],[9],[10],[16]      
Investment, Identifier [Axis]: Amynta Agency Borrower Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00%        
Investment, interest rate 10.42% 10.42% 10.42%        
Investment, principal $ 2,993            
Investment owned, at cost 2,913            
Investments at fair value $ 2,997            
Investment, Identifier [Axis]: Anastasia Parent, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Investment, interest rate 9.40% 9.40% 9.40% 7.42% 7.42% 7.42%  
Investment, principal $ 1,523     $ 1,539      
Investment owned, at cost 1,191     1,203      
Investments at fair value $ 1,099     $ 1,232      
Investment, Identifier [Axis]: Anastasia Parent, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Investment, interest rate 9.40% 9.40% 9.40% 7.42% 7.42% 7.42%  
Investment, principal $ 907     $ 917      
Investment owned, at cost 705     712      
Investments at fair value $ 654     $ 734      
Investment, Identifier [Axis]: Anastasia Parent, LLC, Personal Care Products, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [4],[5] 3.75% 3.75% 3.75%        
Investment, interest rate [2],[4],[5] 9.40% 9.40% 9.40%        
Investment, principal [4],[5],[7] $ 3,700            
Investment owned, at cost [4],[5] 3,067            
Investments at fair value [4],[5] $ 2,669            
Investment, Identifier [Axis]: Anastasia Parent, LLC, Personal Products, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       3.75% 3.75% 3.75%  
Investment, interest rate [9],[10],[11]       7.42% 7.42% 7.42%  
Investment, principal [9],[10],[12]       $ 2,736      
Investment owned, at cost [9],[10]       2,260      
Investments at fair value [9],[10]       $ 2,189      
Investment, Identifier [Axis]: Ankura Consulting Group LLC, Research & Consulting Services, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.00% 8.00% 8.00%  
Investment, interest rate [8],[9],[10],[11]       10.78% 10.78% 10.78%  
Investment, principal [8],[9],[10],[12]       $ 4,346      
Investment owned, at cost [8],[9],[10]       4,281      
Investments at fair value [8],[9],[10]       $ 3,813      
Investment, Identifier [Axis]: Apptio, Inc., Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       6.00% 6.00% 6.00%  
Investment, interest rate [8],[9],[10],[11],[13]       8.46% 8.46% 8.46%  
Investment, principal [8],[9],[10],[12],[13]       $ 892      
Investment owned, at cost [8],[9],[10],[13]       863      
Investments at fair value [8],[9],[10],[13]       $ 846      
Investment, Identifier [Axis]: Apptio, Inc., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.00% 6.00% 6.00%  
Investment, interest rate [8],[9],[10],[11]       8.46% 8.46% 8.46%  
Investment, principal [8],[9],[10],[12]       $ 34,458      
Investment owned, at cost [8],[9],[10]       33,737      
Investments at fair value [8],[9],[10]       $ 33,738      
Investment, Identifier [Axis]: Apptio, Inc., First Lien Revolver | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.00% 6.00% 6.00%  
Investment, interest rate       8.46% 8.46% 8.46%  
Investment, principal       $ 154      
Investment owned, at cost       151      
Investments at fair value       $ 146      
Investment, Identifier [Axis]: Apptio, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.00% 6.00% 6.00%  
Investment, interest rate       8.46% 8.46% 8.46%  
Investment, principal       $ 4,615      
Investment owned, at cost       4,580      
Investments at fair value       $ 4,519      
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, Insurance Brokers, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[4],[5],[14] 7.00% [1],[4],[5],[14] 7.00% [1],[4],[5],[14] 7.00% [8],[9],[10],[16] 7.00% [8],[9],[10],[16] 7.00% [8],[9],[10],[16]  
Investment, interest rate 10.95% [1],[2],[4],[5],[14] 10.95% [1],[2],[4],[5],[14] 10.95% [1],[2],[4],[5],[14] 8.00% [8],[9],[10],[11],[16] 8.00% [8],[9],[10],[11],[16] 8.00% [8],[9],[10],[11],[16]  
Investment, principal | €   € 3,017 [1],[4],[5],[7],[14]     € 1,964 [8],[9],[10],[12],[16]    
Investment owned, at cost $ 3,331 [1],[4],[5],[14]     $ 2,176 [8],[9],[10],[16]      
Investments at fair value $ 3,226 [1],[4],[5],[14]     $ 1,927 [8],[9],[10],[16]      
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, Insurance Brokers, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.75% [1],[4],[5],[14] 5.75% [1],[4],[5],[14] 5.75% [1],[4],[5],[14] 7.00% [8],[9],[10],[16] 7.00% [8],[9],[10],[16] 7.00% [8],[9],[10],[16]  
Investment, interest rate 11.57% [1],[2],[4],[5],[14] 11.57% [1],[2],[4],[5],[14] 11.57% [1],[2],[4],[5],[14] 9.19% [8],[9],[10],[11],[16] 9.19% [8],[9],[10],[11],[16] 9.19% [8],[9],[10],[11],[16]  
Investment, principal $ 10,519 [1],[4],[5],[7],[14]         £ 18,636 [8],[9],[10],[12],[16]  
Investment owned, at cost 10,400 [1],[4],[5],[14]     $ 23,139 [8],[9],[10],[16]      
Investments at fair value $ 10,624 [1],[4],[5],[14]     $ 20,826 [8],[9],[10],[16]      
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, Insurance Brokers, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[4],[5],[14] 7.00% [1],[4],[5],[14] 7.00% [1],[4],[5],[14] 5.75% [8],[9],[10],[16] 5.75% [8],[9],[10],[16] 5.75% [8],[9],[10],[16]  
Investment, interest rate 12.46% [1],[2],[4],[5],[14] 12.46% [1],[2],[4],[5],[14] 12.46% [1],[2],[4],[5],[14] 8.81% [8],[9],[10],[11],[16] 8.81% [8],[9],[10],[11],[16] 8.81% [8],[9],[10],[11],[16]  
Investment, principal     £ 4,949 [1],[4],[5],[7],[14] $ 10,519 [8],[9],[10],[12],[16]      
Investment owned, at cost $ 6,318 [1],[4],[5],[14]     10,357 [8],[9],[10],[16]      
Investments at fair value $ 6,101 [1],[4],[5],[14]     $ 10,328 [8],[9],[10],[16]      
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, Insurance Brokers, First Lien Term Loan 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[4],[5],[14] 7.00% [1],[4],[5],[14] 7.00% [1],[4],[5],[14] 5.75% [8],[9],[10],[13],[16] 5.75% [8],[9],[10],[13],[16] 5.75% [8],[9],[10],[13],[16]  
Investment, interest rate [1],[2],[4],[5],[14] 12.46% 12.46% 12.46%        
Investment, principal | £     £ 23,675 [1],[4],[5],[7],[14]     £ 0 [8],[9],[10],[12],[13],[16]  
Investment owned, at cost $ 28,713 [1],[4],[5],[14]     $ (44) [8],[9],[10],[13],[16]      
Investments at fair value $ 29,185 [1],[4],[5],[14]     0 [8],[9],[10],[13],[16]      
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, Insurance Brokers, First Lien Term Loan 5              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 5.75% 5.75% 5.75%        
Investment, interest rate [1],[2],[4],[5],[14] 9.70% 9.70% 9.70%        
Investment, principal | £ [1],[4],[5],[7],[14]     £ 3,649        
Investment owned, at cost [1],[4],[5],[14] $ 4,094            
Investments at fair value [1],[4],[5],[14] $ 3,914            
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,783,332 1,783,332 1,783,332        
Investments at fair value $ 89     370      
Investment, Identifier [Axis]: Assembled Brands Capital LLC, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.75% 6.75% 6.75%        
Investment, interest rate 12.14% 12.14% 12.14%        
Investment, principal $ 21,852            
Investments at fair value $ 21,823     24,225      
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,129,453 1,129,453 1,129,453        
Investments at fair value $ 1,005     $ 1,223      
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,783,332 [1],[20] 1,783,332 [1],[20] 1,783,332 [1],[20] 1,609,201 [8],[21] 1,609,201 [8],[21] 1,609,201 [8],[21]  
Investment owned, at cost $ 804 [1],[20]     $ 764 [8],[21]      
Investments at fair value $ 89 [1],[20]     $ 370 [8],[21]     $ 587
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.75% [1],[3],[5],[20] 6.75% [1],[3],[5],[20] 6.75% [1],[3],[5],[20] 6.75% [8],[10],[13],[21] 6.75% [8],[10],[13],[21] 6.75% [8],[10],[13],[21]  
Investment, interest rate 12.14% [1],[2],[3],[5],[20] 12.14% [1],[2],[3],[5],[20] 12.14% [1],[2],[3],[5],[20] 10.42% [8],[10],[11],[13],[21] 10.42% [8],[10],[11],[13],[21] 10.42% [8],[10],[11],[13],[21]  
Investment, principal $ 21,852 [1],[3],[5],[7],[20]     $ 24,490 [8],[10],[12],[13],[21]      
Investment owned, at cost 21,855 [1],[3],[5],[20]     24,490 [8],[10],[13],[21]      
Investments at fair value $ 21,823 [1],[3],[5],[20]     $ 24,225 [8],[10],[13],[21]     15,712
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,129,453 [1],[20] 1,129,453 [1],[20] 1,129,453 [1],[20] 1,019,169 [8],[21] 1,019,169 [8],[21] 1,019,169 [8],[21]  
Investment owned, at cost $ 1,159 [1],[20]     $ 1,019 [8],[21]      
Investments at fair value $ 1,005 [1],[20]     $ 1,223 [8],[21]     1,152
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 78,045 [1],[20] 78,045 [1],[20] 78,045 [1],[20] 70,425 [8],[21] 70,425 [8],[21] 70,425 [8],[21]  
Investment owned, at cost $ 0 [1],[20]     $ 0 [8],[21]      
Investments at fair value $ 0 [1],[20]     0 [8],[21]     0
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 78,045 78,045 78,045        
Investments at fair value $ 0     $ 0      
Investment, Identifier [Axis]: Associated Asphalt Partners, LLC, Construction Materials, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       5.25% 5.25% 5.25%  
Investment, interest rate [9],[10],[11]       8.06% 8.06% 8.06%  
Investment, principal [9],[10],[12]       $ 2,501      
Investment owned, at cost [9],[10]       2,331      
Investments at fair value [9],[10]       $ 1,934      
Investment, Identifier [Axis]: Astra Acquisition Corp., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% [4],[5] 5.25% [4],[5] 5.25% [4],[5] 5.25% [9],[10] 5.25% [9],[10] 5.25% [9],[10]  
Investment, interest rate 10.90% [2],[4],[5] 10.90% [2],[4],[5] 10.90% [2],[4],[5] 8.37% [9],[10],[11] 8.37% [9],[10],[11] 8.37% [9],[10],[11]  
Investment, principal $ 8,490 [4],[5],[7]     $ 5,640 [9],[10],[12]      
Investment owned, at cost 8,168 [4],[5]     5,482 [9],[10]      
Investments at fair value $ 6,414 [4],[5]     $ 4,822 [9],[10]      
Investment, Identifier [Axis]: Astra Acquisition Corp., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.90% 10.90% 10.90% 8.37% 8.37% 8.37%  
Investment, principal $ 5,052     $ 5,052      
Investment owned, at cost 4,888     4,858      
Investments at fair value $ 3,817     $ 4,319      
Investment, Identifier [Axis]: Astra Acquisition Corp., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.90% 10.90% 10.90% 8.37% 8.37% 8.37%  
Investment, principal $ 2,078     $ 2,078      
Investment owned, at cost 2,039     2,033      
Investments at fair value $ 1,570     $ 1,777      
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.00% 4.00% 4.00%  
Investment, interest rate       7.70% 7.70% 7.70%  
Investment, principal       $ 5,000      
Investment owned, at cost       4,753      
Investments at fair value       $ 4,276      
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.00% 4.00% 4.00%  
Investment, interest rate       7.70% 7.70% 7.70%  
Investment, principal       $ 2,000      
Investment owned, at cost       1,901      
Investments at fair value       $ 1,711      
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan 1 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.42% 9.42% 9.42%        
Investment, principal $ 4,950            
Investment owned, at cost 4,747            
Investments at fair value $ 4,809            
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan 2 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.25% 4.25% 4.25%        
Investment, interest rate 9.67% 9.67% 9.67%        
Investment, principal $ 1,990            
Investment owned, at cost 1,884            
Investments at fair value $ 1,937            
Investment, Identifier [Axis]: Asurion, LLC, Property & Casualty Insurance, First Lien Term Loan 1 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.42% 9.42% 9.42%        
Investment, principal $ 1,980            
Investment owned, at cost 1,899            
Investments at fair value $ 1,924            
Investment, Identifier [Axis]: Asurion, LLC, Property & Casualty Insurance, First Lien Term Loan 2 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.25% 4.25% 4.25%        
Investment, interest rate 9.67% 9.67% 9.67%        
Investment, principal $ 995            
Investment owned, at cost 942            
Investments at fair value $ 968            
Investment, Identifier [Axis]: Asurion, LLC, Property & Casualty Insurance, Second Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25%        
Investment, interest rate 10.68% 10.68% 10.68%        
Investment, principal $ 2,423            
Investment owned, at cost 2,244            
Investments at fair value $ 2,158            
Investment, Identifier [Axis]: Asurion, LLC, Second Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.68% 10.68% 10.68% 8.37% 8.37% 8.37%  
Investment, principal $ 4,346     $ 4,346      
Investment owned, at cost 4,036     3,981      
Investments at fair value $ 3,871     $ 3,347      
Investment, Identifier [Axis]: Asurion, LLC, Second Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       5.25% 5.25% 5.25%  
Investment, interest rate       8.37% 8.37% 8.37%  
Investment, principal       $ 2,423      
Investment owned, at cost       2,212      
Investments at fair value       $ 1,866      
Investment, Identifier [Axis]: Athenex, Inc., Pharmaceuticals, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [8],[9],[10],[11],[16]       11.00% 11.00% 11.00%  
Investment, principal [8],[9],[12],[16]       $ 13,346      
Investment owned, at cost [8],[9],[16]       12,929      
Investments at fair value [8],[9],[16]       12,812      
Investment, Identifier [Axis]: Athenex, Inc., Pharmaceuticals, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [8],[9],[12],[16],[22]       8,309      
Investment owned, at cost [8],[9],[16],[22]       8,264      
Investments at fair value [8],[9],[16],[22]       $ 8,309      
Investment, Identifier [Axis]: Athenex, Inc., Pharmaceuticals, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9],[16]       328,149 328,149 328,149  
Investment owned, at cost [8],[9],[16]       $ 973      
Investments at fair value [8],[9],[16]       $ 16      
Investment, Identifier [Axis]: Aurora Lux Finco S.À.R.L., Airport Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[4],[5],[14] 6.00% [1],[4],[5],[14] 6.00% [1],[4],[5],[14] 6.00% [8],[9],[10],[16] 6.00% [8],[9],[10],[16] 6.00% [8],[9],[10],[16]  
Investment, interest rate 11.49% [1],[2],[4],[5],[14] 11.49% [1],[2],[4],[5],[14] 11.49% [1],[2],[4],[5],[14] 8.78% [8],[9],[10],[11],[16] 8.78% [8],[9],[10],[11],[16] 8.78% [8],[9],[10],[11],[16]  
Investment, principal $ 29,509 [1],[4],[5],[7],[14]     $ 22,425 [8],[9],[10],[12],[16]      
Investment owned, at cost 29,164 [1],[4],[5],[14]     22,086 [8],[9],[10],[16]      
Investments at fair value $ 28,284 [1],[4],[5],[14]     $ 21,326 [8],[9],[10],[16]      
Investment, Identifier [Axis]: Aurora Lux Finco S.À.R.L., Airport Services, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00%        
Investment, interest rate 11.49% 11.49% 11.49%        
Investment, principal $ 3,628            
Investment owned, at cost 3,586            
Investments at fair value $ 3,478            
Investment, Identifier [Axis]: Aurora Lux Finco S.À.R.L., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Investment, interest rate 11.49% 11.49% 11.49% 8.78% 8.78% 8.78%  
Investment, principal $ 6,289     $ 6,338      
Investment owned, at cost 6,216     6,242      
Investments at fair value $ 6,028     $ 6,027      
Investment, Identifier [Axis]: Aurora Lux Finco S.À.R.L., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.00% 6.00% 6.00%  
Investment, interest rate       8.78% 8.78% 8.78%  
Investment, principal       $ 3,656      
Investment owned, at cost       3,601      
Investments at fair value       $ 3,476      
Investment, Identifier [Axis]: Avalara, Inc., Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.25% 7.25% 7.25%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (108)            
Investments at fair value [1],[3],[4],[5] $ (78)            
Investment, Identifier [Axis]: Avalara, Inc., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[2],[4],[5] 12.64% 12.64% 12.64%        
Investment, principal [1],[4],[5],[7] $ 50,470            
Investment owned, at cost [1],[4],[5] 49,679            
Investments at fair value [1],[4],[5] $ 49,688            
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 1 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.65% 10.65% 10.65% 8.12% 8.12% 8.12%  
Investment, principal $ 1,753     $ 6,371      
Investment owned, at cost 1,742     6,311      
Investments at fair value $ 1,711     $ 6,148      
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 1 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.65% 10.65% 10.65% 8.12% 8.12% 8.12%  
Investment, principal $ 3,363     $ 3,398      
Investment owned, at cost 3,332     3,366      
Investments at fair value $ 3,282     $ 3,279      
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 2 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.65% 10.65% 10.65% 8.12% 8.12% 8.12%  
Investment, principal $ 6,306     $ 1,771      
Investment owned, at cost 6,247     1,751      
Investments at fair value $ 6,155     $ 1,664      
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 2 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.65% 10.65% 10.65% 8.12% 8.12% 8.12%  
Investment, principal $ 800     $ 808      
Investment owned, at cost 795     800      
Investments at fair value $ 780     $ 760      
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       5.00% 5.00% 5.00%  
Investment, interest rate [8],[9],[10],[11],[13]       8.12% 8.12% 8.12%  
Investment, principal [8],[9],[10],[12],[13]       $ 2,546      
Investment owned, at cost [8],[9],[10],[13]       2,503      
Investments at fair value [8],[9],[10],[13]       $ 2,395      
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 5.00% 5.00% 5.00%        
Investment, interest rate [1],[2],[4],[5] 10.65% 10.65% 10.65%        
Investment, principal [1],[4],[5],[7] $ 3,247            
Investment owned, at cost [1],[4],[5] 3,216            
Investments at fair value [1],[4],[5] $ 3,169            
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 5.00% 5.00% 5.00%        
Investment, interest rate [1],[2],[4],[5] 10.65% 10.65% 10.65%        
Investment, principal [1],[4],[5],[7] $ 1,261            
Investment owned, at cost [1],[4],[5] 1,269            
Investments at fair value [1],[4],[5] $ 1,231            
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, Second Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [8],[9],[10] 8.50% [8],[9],[10] 8.50% [8],[9],[10]  
Investment, interest rate 14.15% [1],[2],[4],[5] 14.15% [1],[2],[4],[5] 14.15% [1],[2],[4],[5] 11.62% [8],[9],[10],[11] 11.62% [8],[9],[10],[11] 11.62% [8],[9],[10],[11]  
Investment, principal $ 8,920 [1],[4],[5],[7]     $ 7,166 [8],[9],[10],[12]      
Investment owned, at cost 8,819 [1],[4],[5]     7,059 [8],[9],[10]      
Investments at fair value $ 8,492 [1],[4],[5]     $ 6,915 [8],[9],[10]      
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, Second Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [8],[9],[10],[13] 8.50% [8],[9],[10],[13] 8.50% [8],[9],[10],[13]  
Investment, interest rate 14.15% [1],[2],[4],[5] 14.15% [1],[2],[4],[5] 14.15% [1],[2],[4],[5] 11.62% [8],[9],[10],[11],[13] 11.62% [8],[9],[10],[11],[13] 11.62% [8],[9],[10],[11],[13]  
Investment, principal $ 2,091 [1],[4],[5],[7]     $ 4,227 [8],[9],[10],[12],[13]      
Investment owned, at cost 2,068 [1],[4],[5]     4,070 [8],[9],[10],[13]      
Investments at fair value $ 1,991 [1],[4],[5]     $ 3,839 [8],[9],[10],[13]      
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, Second Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 8.50% 8.50% 8.50%        
Investment, interest rate [1],[2],[4],[5] 14.15% 14.15% 14.15%        
Investment, principal [1],[4],[5],[7] $ 4,361            
Investment owned, at cost [1],[4],[5] 4,297            
Investments at fair value [1],[4],[5] $ 4,152            
Investment, Identifier [Axis]: BYJU's Alpha, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.00% 6.00% 6.00%  
Investment, interest rate       8.98% 8.98% 8.98%  
Investment, principal       $ 7,444      
Investment owned, at cost       7,347      
Investments at fair value       $ 5,455      
Investment, Identifier [Axis]: BYJU's Alpha, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.00% 6.00% 6.00%  
Investment, interest rate       8.98% 8.98% 8.98%  
Investment, principal       $ 3,970      
Investment owned, at cost       3,919      
Investments at fair value       $ 2,909      
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 4.50% 4.50% 4.50%        
Investment, interest rate [1],[2],[3],[4],[5] 13.00% 13.00% 13.00%        
Investment, principal [1],[3],[4],[5],[7] $ 2,221            
Investment owned, at cost [1],[3],[4],[5] 2,188            
Investments at fair value [1],[3],[4],[5] $ 2,178            
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 5.50% 5.50% 5.50%        
Investment, interest rate [1],[2],[4],[5] 11.02% 11.02% 11.02%        
Investment, principal [1],[4],[5],[7] $ 40,660            
Investment owned, at cost [1],[4],[5] 40,440            
Investments at fair value [1],[4],[5] $ 40,213            
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       4.50% 4.50% 4.50%  
Investment, interest rate [8],[9],[10],[11],[13]       10.75% 10.75% 10.75%  
Investment, principal [8],[9],[10],[12],[13]       $ 1,702      
Investment owned, at cost [8],[9],[10],[13]       1,660      
Investments at fair value [8],[9],[10],[13]       $ 1,617      
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       5.50% 5.50% 5.50%  
Investment, interest rate [8],[9],[10],[11]       8.31% 8.31% 8.31%  
Investment, principal [8],[9],[10],[12]       $ 33,078      
Investment owned, at cost [8],[9],[10]       32,612      
Investments at fair value [8],[9],[10]       32,053      
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [8],[9],[12],[13],[16],[22]       0      
Investment owned, at cost [8],[9],[13],[16],[22]       0      
Investments at fair value [8],[9],[13],[16],[22]       $ 0      
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 8.00% [1],[2],[4],[5],[14] 8.00% [1],[2],[4],[5],[14] 8.00% [1],[2],[4],[5],[14] 10.25% [8],[9],[10],[11],[16] 10.25% [8],[9],[10],[11],[16] 10.25% [8],[9],[10],[11],[16]  
Investment, principal $ 6,757 [1],[4],[7],[14]     $ 5,322 [8],[9],[12],[16]      
Investment owned, at cost 6,560 [1],[4],[14]     5,111 [8],[9],[16]      
Investments at fair value 6,225 [1],[4],[14]     $ 5,114 [8],[9],[16]      
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [8],[9],[10],[11],[13],[16]       10.25% 10.25% 10.25%  
Investment, principal 3,316 [1],[4],[7],[14],[15]     $ 0 [8],[9],[12],[13],[16]      
Investment owned, at cost 3,335 [1],[4],[14],[15]     0 [8],[9],[13],[16]      
Investments at fair value $ 3,169 [1],[4],[14],[15]     0 [8],[9],[13],[16]      
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 8.00% 8.00% 8.00%        
Investment, principal $ 0 [1],[3],[4],[7],[14]     2,353 [8],[9],[12],[16],[22]      
Investment owned, at cost 0 [1],[3],[4],[14]     2,353 [8],[9],[16],[22]      
Investments at fair value $ 0 [1],[3],[4],[14]     $ 2,353 [8],[9],[16],[22]      
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 8.00% 8.00% 8.00%        
Investment, principal [1],[3],[4],[7],[14] $ 0            
Investment owned, at cost [1],[3],[4],[14] 0            
Investments at fair value [1],[3],[4],[14] 0            
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 5              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [1],[3],[4],[7],[14],[15] 0            
Investment owned, at cost [1],[3],[4],[14],[15] 0            
Investments at fair value [1],[3],[4],[14],[15] 0            
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 6              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [1],[3],[4],[7],[14],[15] 0            
Investment owned, at cost [1],[3],[4],[14],[15] 0            
Investments at fair value [1],[3],[4],[14],[15] $ 0            
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 26,131 [1],[4],[14] 26,131 [1],[4],[14] 26,131 [1],[4],[14] 21,177 [8],[9],[16] 21,177 [8],[9],[16] 21,177 [8],[9],[16]  
Investment owned, at cost $ 225 [1],[4],[14]     $ 125 [8],[9],[16]      
Investments at fair value $ 3 [1],[4],[14]     $ 98 [8],[9],[16]      
Investment, Identifier [Axis]: Blackhawk Network Holdings, Inc., Data Processing & Outsourced Services, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [4],[5] 7.00% [4],[5] 7.00% [4],[5] 7.00% [9],[10] 7.00% [9],[10] 7.00% [9],[10]  
Investment, interest rate 12.43% [2],[4],[5] 12.43% [2],[4],[5] 12.43% [2],[4],[5] 9.50% [9],[10],[11] 9.50% [9],[10],[11] 9.50% [9],[10],[11]  
Investment, principal $ 30,625 [4],[5],[7]     $ 30,625 [9],[10],[12]      
Investment owned, at cost 30,370 [4],[5]     30,276 [9],[10]      
Investments at fair value $ 29,989 [4],[5]     $ 29,017 [9],[10]      
Investment, Identifier [Axis]: Blackhawk Network Holdings, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.00% 3.00% 3.00%  
Investment, interest rate       6.03% 6.03% 6.03%  
Investment, principal       $ 9,575      
Investment owned, at cost       9,566      
Investments at fair value       $ 8,977      
Investment, Identifier [Axis]: Blumenthal Temecula, LLC, Automotive Retail, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 394,297 [1],[4] 394,297 [1],[4] 394,297 [1],[4] 298,460 [8],[9] 298,460 [8],[9] 298,460 [8],[9]  
Investment owned, at cost $ 424 [1],[4]     $ 298 [8],[9]      
Investments at fair value $ 158 [1],[4]     $ 349 [8],[9]      
Investment, Identifier [Axis]: Blumenthal Temecula, LLC, Automotive Retail, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 9.00% [1],[2],[4],[5] 9.00% [1],[2],[4],[5] 9.00% [1],[2],[4],[5] 9.00% [8],[9],[10],[11] 9.00% [8],[9],[10],[11] 9.00% [8],[9],[10],[11]  
Investment, principal $ 5,257 [1],[4],[7]     $ 3,979 [8],[9],[12]      
Investment owned, at cost 5,258 [1],[4]     3,980 [8],[9]      
Investments at fair value $ 5,251 [1],[4]     $ 3,960 [8],[9]      
Investment, Identifier [Axis]: Blumenthal Temecula, LLC, Automotive Retail, Preferred Equity 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,708,618 [1],[4] 1,708,618 [1],[4] 1,708,618 [1],[4] 1,293,324 [8],[9] 1,293,324 [8],[9] 1,293,324 [8],[9]  
Investment owned, at cost $ 1,711 [1],[4]     $ 1,293 [8],[9]      
Investments at fair value $ 1,999 [1],[4]     $ 1,280 [8],[9]      
Investment, Identifier [Axis]: Blumenthal Temecula, LLC, Automotive Retail, Preferred Equity 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 394,297 [1],[4] 394,297 [1],[4] 394,297 [1],[4] 298,460 [8],[9] 298,460 [8],[9] 298,460 [8],[9]  
Investment owned, at cost $ 395 [1],[4]     $ 298 [8],[9]      
Investments at fair value $ 442 [1],[4]     $ 295 [8],[9]      
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Common Stock | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 171,000 171,000 171,000 171,000 171,000 171,000  
Investment owned, at cost $ 0     $ 0      
Investments at fair value $ 0     $ 0      
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Data Processing & Outsourced Services, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 829 [1] 829 [1] 829 [1] 829 [8],[23],[24] 829 [8],[23],[24] 829 [8],[23],[24]  
Investment, principal       $ 0      
Investment owned, at cost $ 0 [1]     0 [8],[23],[24]      
Investments at fair value $ 0 [1]     $ 0 [8],[23],[24]     0
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Data Processing & Outsourced Services, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 34,984,460 [1] 34,984,460 [1] 34,984,460 [1] 34,984,460 [8],[23],[24] 34,984,460 [8],[23],[24] 34,984,460 [8],[23],[24]  
Investment, principal       $ 0      
Investment owned, at cost $ 34,984 [1]     34,984 [8],[23],[24]      
Investments at fair value $ 27,638 [1]     $ 27,638 [8],[23],[24]     27,638
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Preferred Equity | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 7,193,540,000 7,193,540,000 7,193,540,000 7,193,540 7,193,540 7,193,540  
Investment owned, at cost $ 7,194     $ 7,194      
Investments at fair value $ 5,683     $ 5,683      
Investment, Identifier [Axis]: CCO Holdings LLC, Cable & Satellite, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11],[16]       4.50% 4.50% 4.50%  
Investment, principal [9],[12],[16]       $ 2,097      
Investment owned, at cost [9],[16]       1,746      
Investments at fair value [9],[16]       $ 1,603      
Investment, Identifier [Axis]: CITGO Holding, Inc., Oil & Gas Refining & Marketing, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11]       9.25% 9.25% 9.25%  
Investment, principal [9],[12]       $ 7,857      
Investment owned, at cost [9]       7,857      
Investments at fair value [9]       $ 7,807      
Investment, Identifier [Axis]: CITGO Petroleum Corp., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.25% 6.25% 6.25%  
Investment, interest rate       9.37% 9.37% 9.37%  
Investment, principal       $ 7,038      
Investment owned, at cost       6,967      
Investments at fair value       $ 7,057      
Investment, Identifier [Axis]: CITGO Petroleum Corp., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.25% 6.25% 6.25%  
Investment, interest rate       9.37% 9.37% 9.37%  
Investment, principal       $ 3,519      
Investment owned, at cost       3,484      
Investments at fair value       $ 3,529      
Investment, Identifier [Axis]: CITGO Petroleum Corp., Oil & Gas Refining & Marketing, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       6.25% 6.25% 6.25%  
Investment, interest rate [9],[10],[11]       9.37% 9.37% 9.37%  
Investment, principal [9],[10],[12]       $ 795      
Investment owned, at cost [9],[10]       770      
Investments at fair value [9],[10]       $ 797      
Investment, Identifier [Axis]: CPC Acquisition Corp., Specialty Chemicals, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[17] 7.75% 7.75% 7.75%        
Investment, principal [1],[4],[5],[7],[17] $ 727            
Investment owned, at cost [1],[4],[5],[17] 462            
Investments at fair value [1],[4],[5],[17] $ 396            
Investment, Identifier [Axis]: Cadence Aerospace, LLC, Aerospace & Defense, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.50% 6.50% 6.50%  
Investment, interest rate [8],[9],[10],[11]       9.31% 9.31% 9.31%  
Investment, principal [8],[9],[10],[12]       $ 14,294      
Investment owned, at cost [8],[9],[10]       13,471      
Investments at fair value [8],[9],[10]       $ 13,143      
Investment, Identifier [Axis]: Cadence Aerospace, LLC, Aerospace & Defense, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 12.07% 12.07% 12.07%        
Investment, principal [1],[4],[5],[7] $ 37            
Investment owned, at cost [1],[4],[5] 37            
Investments at fair value [1],[4],[5] $ 37            
Investment, Identifier [Axis]: Cadence Aerospace, LLC, Aerospace & Defense, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 12.07% 12.07% 12.07%        
Investment, principal [1],[4],[5],[7] $ 3,031            
Investment owned, at cost [1],[4],[5] 2,899            
Investments at fair value [1],[4],[5] $ 3,031            
Investment, Identifier [Axis]: Cadence Aerospace, LLC, Aerospace & Defense, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 12.07% 12.07% 12.07%        
Investment, principal [1],[4],[5],[7] $ 1,557            
Investment owned, at cost [1],[4],[5] 1,489            
Investments at fair value [1],[4],[5] $ 1,557            
Investment, Identifier [Axis]: Cadence Aerospace, LLC, Aerospace & Defense, First Lien Term Loan 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 12.07% 12.07% 12.07%        
Investment, principal [1],[4],[5],[7] $ 1,024            
Investment owned, at cost [1],[4],[5] 994            
Investments at fair value [1],[4],[5] $ 1,024            
Investment, Identifier [Axis]: Caregiver Services, Inc., Health Care Services, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,080,399 [1],[20] 1,080,399 [1],[20] 1,080,399 [1],[20] 1,080,399 [8],[21] 1,080,399 [8],[21] 1,080,399 [8],[21]  
Investment owned, at cost $ 1,080 [1],[20]     $ 1,080 [8],[21]      
Investments at fair value $ 432 [1],[20]     378 [8],[21]     838
Investment, Identifier [Axis]: Caregiver Services, Inc., Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,080,399 1,080,399 1,080,399        
Investments at fair value $ 432     $ 378      
Investment, Identifier [Axis]: Carvana Co., Automotive Retail, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11],[16]       5.63% 5.63% 5.63%  
Investment, principal [9],[12],[16]       $ 6,700      
Investment owned, at cost [9],[16]       5,825      
Investments at fair value [9],[16]       $ 4,724      
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Revolver | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 5.50% 5.50% 5.50%  
Investment, interest rate 11.57% 11.57% 11.57%        
Investment, principal $ 600     $ 0      
Investment owned, at cost 592     (10)      
Investments at fair value $ 581     $ (11)      
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Term Loan 1 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 5.50% 5.50% 5.50%  
Investment, interest rate 11.55% 11.55% 11.55% 9.12% 9.12% 9.12%  
Investment, principal $ 2,354     $ 4,358      
Investment owned, at cost 2,322     4,286      
Investments at fair value $ 2,281     $ 4,280      
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Term Loan 2 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 5.50% 5.50% 5.50%  
Investment, interest rate 11.55% 11.55% 11.55% 9.12% 9.12% 9.12%  
Investment, principal $ 1,983     $ 449      
Investment owned, at cost 1,954     432      
Investments at fair value $ 1,921     $ 413      
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Term Loan 3 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00%        
Investment, interest rate 11.55% 11.55% 11.55%        
Investment, principal $ 1,960            
Investment owned, at cost 1,935            
Investments at fair value $ 1,899            
Investment, Identifier [Axis]: CircusTrix Holdings, LLC, Leisure Facilities, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       5.50% 5.50% 5.50%  
Investment, interest rate [8],[9],[10],[11]       8.62% 8.62% 8.62%  
Investment, principal [8],[9],[10],[12]       $ 10,692      
Investment owned, at cost [8],[9],[10]       10,004      
Investments at fair value [8],[9],[10]       $ 10,209      
Investment, Identifier [Axis]: City Football Group Limited, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.50% 3.50% 3.50%  
Investment, interest rate       6.48% 6.48% 6.48%  
Investment, principal       $ 6,451      
Investment owned, at cost       6,419      
Investments at fair value       $ 6,166      
Investment, Identifier [Axis]: City Football Group Limited, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.50% 3.50% 3.50%  
Investment, interest rate       6.48% 6.48% 6.48%  
Investment, principal       $ 2,481      
Investment owned, at cost       2,469      
Investments at fair value       $ 2,372      
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Advertising, Fixed Rate Bond 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 7.50% [2],[4],[5],[14] 7.50% [2],[4],[5],[14] 7.50% [2],[4],[5],[14] 7.50% [9],[10],[11],[16] 7.50% [9],[10],[11],[16] 7.50% [9],[10],[11],[16]  
Investment, principal $ 2,632 [4],[7],[14]     $ 4,311 [9],[12],[16]      
Investment owned, at cost 2,632 [4],[14]     4,311 [9],[16]      
Investments at fair value $ 2,017 [4],[14]     $ 3,132 [9],[16]      
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Advertising, Fixed Rate Bond 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 7.75% [2],[4],[5],[14] 7.75% [2],[4],[5],[14] 7.75% [2],[4],[5],[14] 5.13% [9],[10],[11],[16] 5.13% [9],[10],[11],[16] 5.13% [9],[10],[11],[16]  
Investment, principal $ 176 [4],[7],[14]     $ 1,374 [9],[12],[16]      
Investment owned, at cost 170 [4],[14]     1,229 [9],[16]      
Investments at fair value $ 141 [4],[14]     $ 1,163 [9],[16]      
Investment, Identifier [Axis]: Clear Channel Outdoor Holdings, Inc., Advertising, Fixed Rate Bond 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11],[16]       7.75% 7.75% 7.75%  
Investment, principal [9],[12],[16]       $ 676      
Investment owned, at cost [9],[16]       648      
Investments at fair value [9],[16]       $ 512      
Investment, Identifier [Axis]: Condor Merger Sub Inc., Systems Software, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 7.38% [2],[4],[5] 7.38% [2],[4],[5] 7.38% [2],[4],[5] 7.38% [9],[10],[11] 7.38% [9],[10],[11] 7.38% [9],[10],[11]  
Investment, principal $ 8,420 [4],[7]     $ 8,420 [9],[12]      
Investment owned, at cost 8,261 [4]     8,243 [9]      
Investments at fair value $ 7,059 [4]     $ 6,900 [9]      
Investment, Identifier [Axis]: Continental Intermodal Group LP, Oil & Gas Storage & Transportation, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.50% [1],[4],[5],[17] 8.50% [1],[4],[5],[17] 8.50% [1],[4],[5],[17] 8.50% [8],[9],[10] 8.50% [8],[9],[10] 8.50% [8],[9],[10]  
Investment, interest rate [8],[9],[10],[11]       11.62% 11.62% 11.62%  
Investment, principal $ 22,084 [1],[4],[5],[7],[17]     $ 22,537 [8],[9],[10],[12]      
Investment owned, at cost 21,336 [1],[4],[5],[17]     21,642 [8],[9],[10]      
Investments at fair value 16,040 [1],[4],[5],[17]     20,396 [8],[9],[10]      
Investment, Identifier [Axis]: Continental Intermodal Group LP, Oil & Gas Storage & Transportation, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, at cost 706 [1],[4]     648 [8],[9]      
Investments at fair value $ 0 [1],[4]     $ 457 [8],[9]      
Investment, Identifier [Axis]: Convergeone Holdings, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       5.00% 5.00% 5.00%  
Investment, interest rate       8.12% 8.12% 8.12%  
Investment, principal       $ 7,373      
Investment owned, at cost       7,206      
Investments at fair value       $ 5,320      
Investment, Identifier [Axis]: Convergeone Holdings, Inc., IT Consulting & Other Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       5.00% 5.00% 5.00%  
Investment, interest rate [9],[10],[11]       8.12% 8.12% 8.12%  
Investment, principal [9],[10],[12]       $ 11,913      
Investment owned, at cost [9],[10]       11,697      
Investments at fair value [9],[10]       $ 8,596      
Investment, Identifier [Axis]: Conviva Inc., Application Software, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 417,851 [1],[4] 417,851 [1],[4] 417,851 [1],[4] 417,851 [8],[9] 417,851 [8],[9] 417,851 [8],[9]  
Investment owned, at cost $ 605 [1],[4]     $ 605 [8],[9]      
Investments at fair value $ 894 [1],[4]     $ 894 [8],[9]      
Investment, Identifier [Axis]: CorEvitas, LLC, Health Care Technology, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       1,099 1,099 1,099  
Investment owned, at cost [8],[9]       $ 690      
Investments at fair value [8],[9]       $ 2,340      
Investment, Identifier [Axis]: CorEvitas, LLC, Health Care Technology, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       4.75% 4.75% 4.75%  
Investment, interest rate [8],[9],[10],[11],[13]       11.00% 11.00% 11.00%  
Investment, principal [8],[9],[10],[12],[13]       $ 916      
Investment owned, at cost [8],[9],[10],[13]       898      
Investments at fair value [8],[9],[10],[13]       $ 898      
Investment, Identifier [Axis]: CorEvitas, LLC, Health Care Technology, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       5.75% 5.75% 5.75%  
Investment, interest rate [8],[9],[10],[11]       8.88% 8.88% 8.88%  
Investment, principal [8],[9],[10],[12]       $ 13,712      
Investment owned, at cost [8],[9],[10]       13,554      
Investments at fair value [8],[9],[10]       $ 13,583      
Investment, Identifier [Axis]: Coupa Holdings, LLC, Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.50% 7.50% 7.50%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (20)            
Investments at fair value [1],[3],[4],[5] $ (20)            
Investment, Identifier [Axis]: Coupa Holdings, LLC, Application Software, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.50% 7.50% 7.50%        
Investment, interest rate [1],[2],[4],[5] 12.82% 12.82% 12.82%        
Investment, principal [1],[4],[5],[7] $ 13,157            
Investment owned, at cost [1],[4],[5] 12,855            
Investments at fair value [1],[4],[5] $ 12,858            
Investment, Identifier [Axis]: Coupa Holdings, LLC, Application Software, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.50% 7.50% 7.50%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (15)            
Investments at fair value [1],[3],[4],[5] $ (13)            
Investment, Identifier [Axis]: Covetrus, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.39% 10.39% 10.39% 7.65% 7.65% 7.65%  
Investment, principal $ 6,343     $ 5,375      
Investment owned, at cost 5,983     5,053      
Investments at fair value $ 6,285     $ 5,035      
Investment, Identifier [Axis]: Covetrus, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.39% 10.39% 10.39% 7.65% 7.65% 7.65%  
Investment, principal $ 2,766     $ 2,280      
Investment owned, at cost 2,607     2,143      
Investments at fair value $ 2,741     $ 2,136      
Investment, Identifier [Axis]: Covetrus, Inc., Health Care Distributors, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% [4],[5] 5.00% [4],[5] 5.00% [4],[5] 5.00% [9],[10] 5.00% [9],[10] 5.00% [9],[10]  
Investment, interest rate 10.39% [2],[4],[5] 10.39% [2],[4],[5] 10.39% [2],[4],[5] 7.65% [9],[10],[11] 7.65% [9],[10],[11] 7.65% [9],[10],[11]  
Investment, principal $ 14,750 [4],[5],[7]     $ 10,336 [9],[10],[12]      
Investment owned, at cost 14,173 [4],[5]     9,716 [9],[10]      
Investments at fair value $ 14,616 [4],[5]     $ 9,681 [9],[10]      
Investment, Identifier [Axis]: Coyote Buyer, LLC, Specialty Chemicals, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[3],[4],[5] 6.00% [1],[3],[4],[5] 6.00% [1],[3],[4],[5] 6.00% [8],[9],[10],[13] 6.00% [8],[9],[10],[13] 6.00% [8],[9],[10],[13]  
Investment, interest rate [2],[5] 11.47% 11.47% 11.47%        
Investment, principal $ 933 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost 920 [1],[3],[4],[5]     (13) [8],[9],[10],[13]      
Investments at fair value $ 918 [1],[3],[4],[5]     $ (26) [8],[9],[10],[13]      
Investment, Identifier [Axis]: Coyote Buyer, LLC, Specialty Chemicals, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[4],[5] 6.00% [1],[4],[5] 6.00% [1],[4],[5] 6.00% [8],[9],[10] 6.00% [8],[9],[10] 6.00% [8],[9],[10]  
Investment, interest rate 11.52% [1],[2],[4],[5] 11.52% [1],[2],[4],[5] 11.52% [1],[2],[4],[5] 8.81% [8],[9],[10],[11] 8.81% [8],[9],[10],[11] 8.81% [8],[9],[10],[11]  
Investment, principal $ 18,013 [1],[4],[5],[7]     $ 18,200 [8],[9],[10],[12]      
Investment owned, at cost 17,690 [1],[4],[5]     17,790 [8],[9],[10]      
Investments at fair value $ 17,812 [1],[4],[5]     $ 17,843 [8],[9],[10]      
Investment, Identifier [Axis]: Curium Bidco S.à.r.l., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.50% 4.50% 4.50% 4.00% 4.00% 4.00%  
Investment, interest rate 9.89% 9.89% 9.89% 7.67% 7.67% 7.67%  
Investment, principal $ 8,730     $ 5,820      
Investment owned, at cost 8,642     5,776      
Investments at fair value $ 8,730     $ 5,587      
Investment, Identifier [Axis]: Curium Bidco S.à.r.l., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.50% 4.50% 4.50% 4.00% 4.00% 4.00%  
Investment, interest rate 9.89% 9.89% 9.89% 7.67% 7.67% 7.67%  
Investment, principal $ 2,841     $ 2,870      
Investment owned, at cost 2,820     2,849      
Investments at fair value $ 2,841     $ 2,756      
Investment, Identifier [Axis]: DTI Holdco, Inc First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.75% 4.75% 4.75%        
Investment, interest rate 10.12% 10.12% 10.12%        
Investment, principal $ 2,970            
Investment owned, at cost 2,922            
Investments at fair value $ 2,899            
Investment, Identifier [Axis]: DTI Holdco, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.75% 4.75% 4.75% 4.75% 4.75% 4.75%  
Investment, interest rate 10.12% 10.12% 10.12% 7.33% 7.33% 7.33%  
Investment, principal $ 7,920     $ 8,000      
Investment owned, at cost 7,792     7,849      
Investments at fair value $ 7,729     $ 7,616      
Investment, Identifier [Axis]: DTI Holdco, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.75% 4.75% 4.75%  
Investment, interest rate       7.33% 7.33% 7.33%  
Investment, principal       $ 3,000      
Investment owned, at cost       2,943      
Investments at fair value       $ 2,856      
Investment, Identifier [Axis]: DTI Holdco, Inc., Research & Consulting Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.75% [4],[5] 4.75% [4],[5] 4.75% [4],[5] 4.75% [9],[10] 4.75% [9],[10] 4.75% [9],[10]  
Investment, interest rate 10.12% [2],[4],[5] 10.12% [2],[4],[5] 10.12% [2],[4],[5] 7.33% [9],[10],[11] 7.33% [9],[10],[11] 7.33% [9],[10],[11]  
Investment, principal $ 4,950 [4],[5],[7]     $ 5,000 [9],[10],[12]      
Investment owned, at cost 4,871 [4],[5]     4,906 [9],[10]      
Investments at fair value $ 4,831 [4],[5]     $ 4,760 [9],[10]      
Investment, Identifier [Axis]: Dealer Tire, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.25% 4.25% 4.25%  
Investment, interest rate       7.37% 7.37% 7.37%  
Investment, principal       $ 2,992      
Investment owned, at cost       2,935      
Investments at fair value       $ 2,924      
Investment, Identifier [Axis]: Delivery Hero FinCo LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       5.75% 5.75% 5.75%  
Investment, interest rate       8.49% 8.49% 8.49%  
Investment, principal       $ 6,035      
Investment owned, at cost       5,876      
Investments at fair value       $ 5,756      
Investment, Identifier [Axis]: Delivery Hero FinCo LLC, Internet & Direct Marketing Retail, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10],[16]       5.75% 5.75% 5.75%  
Investment, interest rate [9],[10],[11],[16]       8.49% 8.49% 8.49%  
Investment, principal [9],[10],[12],[16]       $ 4,988      
Investment owned, at cost [9],[10],[16]       4,882      
Investments at fair value [9],[10],[16]       $ 4,757      
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 2 [1],[4],[14] 2 [1],[4],[14] 2 [1],[4],[14] 2 [8],[9],[16] 2 [8],[9],[16] 2 [8],[9],[16]  
Investment owned, at cost $ 2 [1],[4],[14]     $ 2 [8],[9],[16]      
Investments at fair value $ 2 [1],[4],[14]     $ 2 [8],[9],[16]      
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 419 [1],[4],[14] 419 [1],[4],[14] 419 [1],[4],[14] 419 [8],[9],[16] 419 [8],[9],[16] 419 [8],[9],[16]  
Investment owned, at cost $ 419 [1],[4],[14]     $ 419 [8],[9],[16]      
Investments at fair value $ 419 [1],[4],[14]     $ 419 [8],[9],[16]      
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Subordinated Debt Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 3.00% [1],[2],[3],[4],[5],[14] 3.00% [1],[2],[3],[4],[5],[14] 3.00% [1],[2],[3],[4],[5],[14] 10.00% [8],[9],[10],[11],[13],[16] 10.00% [8],[9],[10],[11],[13],[16] 10.00% [8],[9],[10],[11],[13],[16]  
Investment, principal $ 17,465 [1],[3],[4],[7],[14]     $ 4,183 [8],[9],[12],[13],[16]      
Investment owned, at cost 17,465 [1],[3],[4],[14]     4,183 [8],[9],[13],[16]      
Investments at fair value $ 17,465 [1],[3],[4],[14]     $ 4,183 [8],[9],[13],[16]      
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 31 [1],[4],[14] 31 [1],[4],[14] 31 [1],[4],[14] 31 [8],[9],[16] 31 [8],[9],[16] 31 [8],[9],[16]  
Investment owned, at cost $ 0 [1],[4],[14]     $ 0 [8],[9],[16]      
Investments at fair value $ 0 [1],[4],[14]     $ 0 [8],[9],[16]      
Investment, Identifier [Axis]: Delta Topco, Inc., Systems Software, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       7.25% 7.25% 7.25%  
Investment, interest rate [9],[10],[11]       9.34% 9.34% 9.34%  
Investment, principal [9],[10],[12]       $ 6,680      
Investment owned, at cost [9],[10]       6,647      
Investments at fair value [9],[10]       $ 5,934      
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 9.00% 9.00% 9.00%        
Investment, interest rate [1],[2],[4],[5] 14.54% 14.54% 14.54%        
Investment, principal [1],[4],[5],[7] $ 20,757            
Investment owned, at cost [1],[4],[5] 20,146            
Investments at fair value [1],[4],[5] 20,653            
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       9.00% 9.00% 9.00%  
Investment, interest rate [8],[9],[10],[11]       12.67% 12.67% 12.67%  
Investment, principal [8],[9],[10],[12]       $ 24,396      
Investment owned, at cost [8],[9],[10]       23,083      
Investments at fair value [8],[9],[10]       $ 22,993      
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       9.00% 9.00% 9.00%  
Investment, principal [8],[9],[10],[12],[13]       $ 0      
Investment owned, at cost [8],[9],[10],[13]       (135)      
Investments at fair value [8],[9],[10],[13]       $ (129)      
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, Subordinated Debt Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [1],[4],[7] 654            
Investment owned, at cost [1],[4] 653            
Investments at fair value [1],[4] $ 631            
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 6,397,254 [1],[4] 6,397,254 [1],[4] 6,397,254 [1],[4] 5,403,823 [8],[9] 5,403,823 [8],[9] 5,403,823 [8],[9]  
Investment owned, at cost $ 1,642 [1],[4]     $ 1,405 [8],[9]      
Investments at fair value $ 1,152 [1],[4]     $ 1,297 [8],[9]      
Investment, Identifier [Axis]: Digital.AI Software Holdings, Inc., Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[3],[4],[5] 7.00% [1],[3],[4],[5] 7.00% [1],[3],[4],[5] 6.50% [8],[9],[10],[13] 6.50% [8],[9],[10],[13] 6.50% [8],[9],[10],[13]  
Investment, interest rate 12.49% [1],[2],[3],[4],[5] 12.49% [1],[2],[3],[4],[5] 12.49% [1],[2],[3],[4],[5] 9.41% [8],[9],[10],[11],[13] 9.41% [8],[9],[10],[11],[13] 9.41% [8],[9],[10],[11],[13]  
Investment, principal $ 284 [1],[3],[4],[5],[7]     $ 251 [8],[9],[10],[12],[13]      
Investment owned, at cost 265 [1],[3],[4],[5]     228 [8],[9],[10],[13]      
Investments at fair value $ 252 [1],[3],[4],[5]     $ 239 [8],[9],[10],[13]      
Investment, Identifier [Axis]: Digital.AI Software Holdings, Inc., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[4],[5] 7.00% [1],[4],[5] 7.00% [1],[4],[5] 7.00% [8],[9],[10] 7.00% [8],[9],[10] 7.00% [8],[9],[10]  
Investment, interest rate 12.49% [1],[2],[4],[5] 12.49% [1],[2],[4],[5] 12.49% [1],[2],[4],[5] 9.91% [8],[9],[10],[11] 9.91% [8],[9],[10],[11] 9.91% [8],[9],[10],[11]  
Investment, principal $ 12,386 [1],[4],[5],[7]     $ 9,902 [8],[9],[10],[12]      
Investment owned, at cost 12,208 [1],[4],[5]     9,599 [8],[9],[10]      
Investments at fair value $ 12,101 [1],[4],[5]     $ 9,793 [8],[9],[10]      
Investment, Identifier [Axis]: DirecTV Financing, LLC, Cable & Satellite, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% [4],[5] 5.00% [4],[5] 5.00% [4],[5] 5.00% [9],[10] 5.00% [9],[10] 5.00% [9],[10]  
Investment, interest rate 10.43% [2],[4],[5] 10.43% [2],[4],[5] 10.43% [2],[4],[5] 8.12% [9],[10],[11] 8.12% [9],[10],[11] 8.12% [9],[10],[11]  
Investment, principal $ 4,641 [4],[5],[7]     $ 19,242 [9],[10],[12]      
Investment owned, at cost 4,619 [4],[5]     18,970 [9],[10]      
Investments at fair value $ 4,546 [4],[5]     $ 17,973 [9],[10]      
Investment, Identifier [Axis]: DirecTV Financing, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.43% 10.43% 10.43% 8.12% 8.12% 8.12%  
Investment, principal $ 5,799     $ 6,436      
Investment owned, at cost 5,715     6,332      
Investments at fair value $ 5,681     $ 6,012      
Investment, Identifier [Axis]: DirecTV Financing, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.43% 10.43% 10.43% 8.12% 8.12% 8.12%  
Investment, principal $ 2,460     $ 2,730      
Investment owned, at cost 2,435     2,703      
Investments at fair value $ 2,410     $ 2,549      
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 30,031 [1] 30,031 [1] 30,031 [1] 30,031 [8],[23],[24] 30,031 [8],[23],[24] 30,031 [8],[23],[24]  
Investment owned, at cost $ 15,222 [1]     $ 15,222 [8],[23],[24]      
Investments at fair value $ 2,711 [1]     $ 4,946 [8],[23],[24]     18,065
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% [1],[5] 5.00% [1],[5] 5.00% [1],[5] 5.00% [8],[10],[13],[23],[24] 5.00% [8],[10],[13],[23],[24] 5.00% [8],[10],[13],[23],[24]  
Investment, interest rate 10.54% [1],[2],[5] 10.54% [1],[2],[5] 10.54% [1],[2],[5] 5.00% 5.00% 5.00%  
Investment, principal $ 5,574 [1],[5],[7]     $ 0 [8],[10],[12],[13],[23],[24]      
Investment owned, at cost 5,574 [1],[5]     0 [8],[10],[13],[23],[24]      
Investments at fair value $ 5,574 [1],[5]     $ 0 [8],[10],[13],[23],[24]     0
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[10],[23],[24]       5.00% 5.00% 5.00%  
Investment, interest rate [8],[10],[11],[23],[24]       8.68% 8.68% 8.68%  
Investment, principal [8],[10],[12],[23],[24]       $ 14,333      
Investment owned, at cost [8],[10],[23],[24]       14,333      
Investments at fair value       14,333 [8],[10],[23],[24]     27,381
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[5] 5.00% 5.00% 5.00%        
Investment, interest rate [1],[2],[5] 10.54% 10.54% 10.54%        
Investment, principal [1],[5],[7] $ 14,068            
Investment owned, at cost [1],[5] 14,068            
Investments at fair value $ 14,068 [1],[5]     14,333      
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[5] 5.00% 5.00% 5.00%        
Investment, interest rate [1],[2],[3],[5] 10.42% 10.42% 10.42%        
Investment, principal [1],[3],[5],[7] $ 2,090            
Investment owned, at cost [1],[3],[5] 2,090            
Investments at fair value $ 2,090 [1],[3],[5]     $ 0      
Investment, Identifier [Axis]: Domtar Corporation, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       5.50% 5.50% 5.50%  
Investment, interest rate       8.26% 8.26% 8.26%  
Investment, principal       $ 4,100      
Investment owned, at cost       4,065      
Investments at fair value       $ 3,921      
Investment, Identifier [Axis]: Domtar Corporation, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       5.50% 5.50% 5.50%  
Investment, interest rate       8.26% 8.26% 8.26%  
Investment, principal       $ 2,503      
Investment owned, at cost       2,478      
Investments at fair value       $ 2,394      
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, Leisure Facilities, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 12,500 [1],[4] 12,500 [1],[4] 12,500 [1],[4] 12,500 [8],[9] 12,500 [8],[9] 12,500 [8],[9]  
Investment owned, at cost $ 0 [1],[4]     $ 0 [8],[9]      
Investments at fair value $ 0 [1],[4]     $ 0 [8],[9]      
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, Leisure Facilities, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 488 [1],[4] 488 [1],[4] 488 [1],[4] 488 [8],[9] 488 [8],[9] 488 [8],[9]  
Investment owned, at cost $ 488 [1],[4]     $ 488 [8],[9]      
Investments at fair value $ 1,345 [1],[4]     $ 966 [8],[9]      
Investment, Identifier [Axis]: Eagle Parent Corp., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.25% 4.25% 4.25%  
Investment, interest rate       7.80% 7.80% 7.80%  
Investment, principal       $ 4,478      
Investment owned, at cost       4,373      
Investments at fair value       $ 4,367      
Investment, Identifier [Axis]: Eagle Parent Corp., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.25% 4.25% 4.25%  
Investment, interest rate       7.80% 7.80% 7.80%  
Investment, principal       $ 2,488      
Investment owned, at cost       2,429      
Investments at fair value       $ 2,426      
Investment, Identifier [Axis]: Eagleview Technology Corporation, Application Software, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% [1],[4],[5] 7.50% [1],[4],[5] 7.50% [1],[4],[5] 7.50% [8],[9],[10] 7.50% [8],[9],[10] 7.50% [8],[9],[10]  
Investment, interest rate 13.04% [1],[2],[4],[5] 13.04% [1],[2],[4],[5] 13.04% [1],[2],[4],[5] 11.17% [8],[9],[10],[11] 11.17% [8],[9],[10],[11] 11.17% [8],[9],[10],[11]  
Investment, principal $ 8,974 [1],[4],[5],[7]     $ 8,974 [8],[9],[10],[12]      
Investment owned, at cost 8,884 [1],[4],[5]     8,884 [8],[9],[10]      
Investments at fair value $ 7,987 [1],[4],[5]     $ 8,503 [8],[9],[10]      
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 3.00% [1],[2],[4],[5],[14] 3.00% [1],[2],[4],[5],[14] 3.00% [1],[2],[4],[5],[14] 3.00% [8],[9],[10],[11],[16] 3.00% [8],[9],[10],[11],[16] 3.00% [8],[9],[10],[11],[16]  
Investment, principal $ 11,065 [1],[4],[7],[14]     $ 10,418 [8],[9],[12],[16]      
Investment owned, at cost 10,953 [1],[4],[14]     10,275 [8],[9],[16]      
Investments at fair value $ 10,677 [1],[4],[14]     $ 10,231 [8],[9],[16]      
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 3.00% [1],[2],[4],[5],[14] 3.00% [1],[2],[4],[5],[14] 3.00% [1],[2],[4],[5],[14] 3.00% [8],[9],[10],[11],[13],[16] 3.00% [8],[9],[10],[11],[13],[16] 3.00% [8],[9],[10],[11],[13],[16]  
Investment, principal $ 1,772 [1],[4],[7],[14]     $ 0 [8],[9],[12],[13],[16]      
Investment owned, at cost 1,748 [1],[4],[14]     3 [8],[9],[13],[16]      
Investments at fair value $ 1,710 [1],[4],[14]     $ 0 [8],[9],[13],[16]      
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[3],[4],[5],[14] 3.00% 3.00% 3.00%        
Investment, principal [1],[3],[4],[7],[14] $ 0            
Investment owned, at cost [1],[3],[4],[14] 1            
Investments at fair value [1],[3],[4],[14] $ 0            
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[3],[4],[5],[14] 3.00% 3.00% 3.00%        
Investment, principal [1],[3],[4],[7],[14] $ 0            
Investment owned, at cost [1],[3],[4],[14] 1            
Investments at fair value [1],[3],[4],[14] $ 0            
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[4],[5] 11.32% 11.32% 11.32%        
Investment, principal [1],[4],[5],[7] $ 14,736            
Investment owned, at cost [1],[4],[5] 14,368            
Investments at fair value [1],[4],[5] $ 14,368            
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, Application Software,First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 6.00% 6.00% 6.00%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (41)            
Investments at fair value [1],[3],[4],[5] $ (41)            
Investment, Identifier [Axis]: FINThrive Software Intermediate Holdings, Inc., Health Care Technology, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.75% [4],[5] 6.75% [4],[5] 6.75% [4],[5] 6.75% [9],[10] 6.75% [9],[10] 6.75% [9],[10]  
Investment, interest rate 12.18% [2],[4],[5] 12.18% [2],[4],[5] 12.18% [2],[4],[5] 9.87% [9],[10],[11] 9.87% [9],[10],[11] 9.87% [9],[10],[11]  
Investment, principal $ 31,074 [4],[5],[7]     $ 25,061 [9],[10],[12]      
Investment owned, at cost 29,127 [4],[5]     24,685 [9],[10]      
Investments at fair value $ 19,917 [4],[5]     $ 21,646 [9],[10]      
Investment, Identifier [Axis]: Fairbridge Strategic Capital Funding LLC, Real Estate Operating Companies, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 9.00% [1],[2],[3],[4],[5] 9.00% [1],[2],[3],[4],[5] 9.00% [1],[2],[3],[4],[5] 9.00% [8],[9],[10],[11],[25] 9.00% [8],[9],[10],[11],[25] 9.00% [8],[9],[10],[11],[25]  
Investment, principal $ 59,950 [1],[3],[4],[7]     $ 27,850 [8],[9],[12],[25]      
Investment owned, at cost 59,950 [1],[3],[4]     27,850 [8],[9],[25]      
Investments at fair value $ 59,950 [1],[3],[4]     $ 27,850 [8],[9],[25]      
Investment, Identifier [Axis]: Fairbridge Strategic Capital Funding LLC, Real Estate Operating Companies, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 3,750 [1],[4],[14] 3,750 [1],[4],[14] 3,750 [1],[4],[14] 2,500 [8],[9],[16],[25] 2,500 [8],[9],[16],[25] 2,500 [8],[9],[16],[25]  
Investment owned, at cost $ 0 [1],[4],[14]     $ 0 [8],[9],[16],[25]      
Investments at fair value $ 3 [1],[4],[14]     $ 3 [8],[9],[16],[25]      
Investment, Identifier [Axis]: Finastra USA, Inc.Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5],[14] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[3],[4],[5],[14] 12.55% 12.55% 12.55%        
Investment, principal [1],[3],[4],[5],[7],[14] $ 258            
Investment owned, at cost [1],[3],[4],[5],[14] 234            
Investments at fair value [1],[3],[4],[5],[14] $ 234            
Investment, Identifier [Axis]: Finastra USA, Inc.Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[4],[5],[14] 12.55% 12.55% 12.55%        
Investment, principal [1],[4],[5],[7],[14] $ 11,742            
Investment owned, at cost [1],[4],[5],[14] 11,509            
Investments at fair value [1],[4],[5],[14] 11,511            
Investment, Identifier [Axis]: First Star Speir Aviation Limited, Airlines, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate       9.00% 9.00% 9.00%  
Investments at fair value       $ 0     7,500
Investment, Identifier [Axis]: First Star Speir Aviation Limited, Airlines, Membership Interest              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares       1 1 1  
Investments at fair value       $ 0     698
Investment, Identifier [Axis]: Five Largest Loan Exposures To Borrowers | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal 54,051     48,139      
Investment, Identifier [Axis]: Five Largest Loan Exposures To Borrowers | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal $ 28,396     $ 28,973      
Investment, Identifier [Axis]: Fortress Biotech, Inc., Biotechnology, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 11.00% [1],[2],[4],[5],[14] 11.00% [1],[2],[4],[5],[14] 11.00% [1],[2],[4],[5],[14] 11.00% [8],[9],[10],[11],[16] 11.00% [8],[9],[10],[11],[16] 11.00% [8],[9],[10],[11],[16]  
Investment, principal $ 11,918 [1],[4],[7],[14]     $ 9,466 [8],[9],[12],[16]      
Investment owned, at cost 11,612 [1],[4],[14]     9,071 [8],[9],[16]      
Investments at fair value $ 11,144 [1],[4],[14]     $ 9,008 [8],[9],[16]      
Investment, Identifier [Axis]: Fortress Biotech, Inc., Biotechnology, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 417,011 [1],[4],[14] 417,011 [1],[4],[14] 417,011 [1],[4],[14] 331,200 [8],[9],[16] 331,200 [8],[9],[16] 331,200 [8],[9],[16]  
Investment owned, at cost $ 427 [1],[4],[14]     $ 405 [8],[9],[16]      
Investments at fair value $ 42 [1],[4],[14]     $ 66 [8],[9],[16]      
Investment, Identifier [Axis]: Frontier Communications Holdings, LLC, Integrated Telecommunication Services, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 6.00% [2],[4],[5],[14] 6.00% [2],[4],[5],[14] 6.00% [2],[4],[5],[14] 6.00% [9],[10],[11],[16] 6.00% [9],[10],[11],[16] 6.00% [9],[10],[11],[16]  
Investment, principal $ 4,881 [4],[7],[14]     $ 4,881 [9],[12],[16]      
Investment owned, at cost 4,469 [4],[14]     4,420 [9],[16]      
Investments at fair value $ 3,577 [4],[14]     $ 3,845 [9],[16]      
Investment, Identifier [Axis]: GKD Index Partners, LLC, Specialized Finance, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11],[13]       10.60% 10.60% 10.60%  
Investment, principal [8],[9],[10],[12],[13]       $ 1,280      
Investment owned, at cost [8],[9],[10],[13]       1,268      
Investments at fair value [8],[9],[10],[13]       $ 1,262      
Investment, Identifier [Axis]: GKD Index Partners, LLC, Specialized Finance, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11]       10.67% 10.67% 10.67%  
Investment, principal [8],[9],[10],[12]       $ 25,128      
Investment owned, at cost [8],[9],[10]       24,915      
Investments at fair value [8],[9],[10]       $ 24,851      
Investment, Identifier [Axis]: Galileo Parent, Inc., Aerospace & Defense, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[2],[3],[4],[5] 12.64% 12.64% 12.64%        
Investment, principal [1],[3],[4],[5],[7] $ 1,638            
Investment owned, at cost [1],[3],[4],[5] 1,535            
Investments at fair value [1],[3],[4],[5] $ 1,535            
Investment, Identifier [Axis]: Galileo Parent, Inc., Aerospace & Defense, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[2],[4],[5] 12.64% 12.64% 12.64%        
Investment, principal [1],[4],[5],[7] $ 23,774            
Investment owned, at cost [1],[4],[5] 23,110            
Investments at fair value [1],[4],[5] $ 23,110            
Investment, Identifier [Axis]: Gibson Brands, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.57% 10.57% 10.57% 7.94% 7.94% 7.94%  
Investment, principal $ 7,369     $ 7,444      
Investment owned, at cost 7,295     7,369      
Investments at fair value $ 6,190     $ 6,029      
Investment, Identifier [Axis]: Gibson Brands, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.57% 10.57% 10.57% 7.94% 7.94% 7.94%  
Investment, principal $ 3,930     $ 3,970      
Investment owned, at cost 3,891     3,930      
Investments at fair value $ 3,301     $ 3,216      
Investment, Identifier [Axis]: Gibson Brands, Inc., Leisure Products, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 5.00% 5.00% 5.00%        
Investment, interest rate [1],[2],[4],[5] 10.57% 10.57% 10.57%        
Investment, principal [1],[4],[5],[7] $ 2,456            
Investment owned, at cost [1],[4],[5] 2,055            
Investments at fair value [1],[4],[5] $ 2,063            
Investment, Identifier [Axis]: Global Medical Response, Inc., First Lien Term Loan 1 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.25% 4.25% 4.25%  
Investment, interest rate       7.37% 7.37% 7.37%  
Investment, principal       $ 1,979      
Investment owned, at cost       1,979      
Investments at fair value       $ 1,722      
Investment, Identifier [Axis]: Global Medical Response, Inc., First Lien Term Loan 2 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.25% 4.25% 4.25%  
Investment, interest rate       6.81% 6.81% 6.81%  
Investment, principal       $ 2,192      
Investment owned, at cost       2,165      
Investments at fair value       $ 1,912      
Investment, Identifier [Axis]: Global Medical Response, Inc., Health Care Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       4.25% 4.25% 4.25%  
Investment, interest rate [9],[10],[11]       7.37% 7.37% 7.37%  
Investment, principal [9],[10],[12]       $ 5,572      
Investment owned, at cost [9],[10]       5,435      
Investments at fair value [9],[10]       $ 4,848      
Investment, Identifier [Axis]: GoldenTree Loan Management EUR CLO 2 DAC, Multi-Sector Holdings, CLO Notes              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [4],[5],[14] 2.85% 2.85% 2.85%        
Investment, interest rate [2],[4],[5],[14] 6.56% 6.56% 6.56%        
Investment, principal | € [4],[5],[7],[14]   € 1,000          
Investment owned, at cost [4],[5],[14] $ 876            
Investments at fair value [4],[5],[14] $ 963            
Investment, Identifier [Axis]: Grove Hotel Parcel Owner, LLC, Hotels, Resorts & Cruise Lines, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [1],[3],[4],[5] 8.00% [1],[3],[4],[5] 8.00% [1],[3],[4],[5] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13]  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost (27) [1],[3],[4],[5]     (27) [8],[9],[10],[13]      
Investments at fair value $ (35) [1],[3],[4],[5]     $ (25) [8],[9],[10],[13]      
Investment, Identifier [Axis]: Grove Hotel Parcel Owner, LLC, Hotels, Resorts & Cruise Lines, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [1],[4],[5] 8.00% [1],[4],[5] 8.00% [1],[4],[5] 8.00% [8],[9],[10] 8.00% [8],[9],[10] 8.00% [8],[9],[10]  
Investment, interest rate 13.42% [1],[2],[4],[5] 13.42% [1],[2],[4],[5] 13.42% [1],[2],[4],[5] 11.04% [8],[9],[10],[11] 11.04% [8],[9],[10],[11] 11.04% [8],[9],[10],[11]  
Investment, principal $ 17,444 [1],[4],[5],[7]     $ 14,311 [8],[9],[10],[12]      
Investment owned, at cost 17,276 [1],[4],[5]     14,041 [8],[9],[10]      
Investments at fair value $ 17,096 [1],[4],[5]     $ 14,060 [8],[9],[10]      
Investment, Identifier [Axis]: Grove Hotel Parcel Owner, LLC, Hotels, Resorts & Cruise Lines, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [1],[3],[4],[5] 8.00% [1],[3],[4],[5] 8.00% [1],[3],[4],[5] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13]  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost (54) [1],[3],[4],[5]     (54) [8],[9],[10],[13]      
Investments at fair value $ (70) [1],[3],[4],[5]     $ (50) [8],[9],[10],[13]      
Investment, Identifier [Axis]: Harbor Purchaser Inc., Education Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% [4],[5] 5.25% [4],[5] 5.25% [4],[5] 5.25% [9],[10] 5.25% [9],[10] 5.25% [9],[10]  
Investment, interest rate 10.67% [2],[4],[5] 10.67% [2],[4],[5] 10.67% [2],[4],[5] 8.38% [9],[10],[11] 8.38% [9],[10],[11] 8.38% [9],[10],[11]  
Investment, principal $ 14,347 [4],[5],[7]     $ 9,392 [9],[10],[12]      
Investment owned, at cost 13,871 [4],[5]     9,080 [9],[10]      
Investments at fair value $ 13,618 [4],[5]     $ 8,582 [9],[10]      
Investment, Identifier [Axis]: Harbor Purchaser Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.67% 10.67% 10.67% 8.38% 8.38% 8.38%  
Investment, principal $ 7,920     $ 8,000      
Investment owned, at cost 7,731     7,774      
Investments at fair value $ 7,517     $ 7,310      
Investment, Identifier [Axis]: Harbor Purchaser Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.67% 10.67% 10.67% 8.38% 8.38% 8.38%  
Investment, principal $ 3,960     $ 4,000      
Investment owned, at cost 3,865     3,887      
Investments at fair value $ 3,759     $ 3,655      
Investment, Identifier [Axis]: Harrow , Inc., Pharmaceuticals, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5],[14] 11.89% 11.89% 11.89%        
Investment, principal [1],[4],[5],[7],[14] $ 7,448            
Investment owned, at cost [1],[4],[5],[14] 7,296            
Investments at fair value [1],[4],[5],[14] $ 7,301            
Investment, Identifier [Axis]: Harrow, Inc., Pharmaceuticals, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5],[14] 6.50% 6.50% 6.50%        
Investment, principal [1],[3],[4],[5],[7],[14] $ 0            
Investment owned, at cost [1],[3],[4],[5],[14] (82)            
Investments at fair value [1],[3],[4],[5],[14] $ (79)            
Investment, Identifier [Axis]: Harrow, Inc., Pharmaceuticals, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5],[14] 12.04% 12.04% 12.04%        
Investment, principal [1],[4],[5],[7],[14] $ 1,432            
Investment owned, at cost [1],[4],[5],[14] 1,399            
Investments at fair value [1],[4],[5],[14] $ 1,404            
Investment, Identifier [Axis]: Horizon Aircraft Finance I Ltd., Specialized Finance, CLO Notes              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [2],[4],[5],[14] 4.46% 4.46% 4.46%        
Investment, principal [4],[7],[14] $ 6,808            
Investment owned, at cost [4],[14] 5,490            
Investments at fair value [4],[14] $ 5,873            
Investment, Identifier [Axis]: IAMGOLD Corporation, Gold, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 8.25% 8.25% 8.25%        
Investment, interest rate [1],[2],[4],[5],[14] 13.62% 13.62% 13.62%        
Investment, principal [1],[4],[5],[7],[14] $ 23,975            
Investment owned, at cost [1],[4],[5],[14] 23,310            
Investments at fair value [1],[4],[5],[14] $ 23,328            
Investment, Identifier [Axis]: INW Manufacturing, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Investment, interest rate 11.40% 11.40% 11.40% 9.42% 9.42% 9.42%  
Investment, principal $ 9,000     $ 9,500      
Investment owned, at cost 8,839     9,282      
Investments at fair value $ 7,080     $ 8,408      
Investment, Identifier [Axis]: INW Manufacturing, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Investment, interest rate 11.40% 11.40% 11.40% 9.42% 9.42% 9.42%  
Investment, principal $ 2,250     $ 2,375      
Investment owned, at cost 2,210     2,320      
Investments at fair value $ 1,770     $ 2,102      
Investment, Identifier [Axis]: INW Manufacturing, LLC, Personal Care Products, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 5.75% 5.75% 5.75%        
Investment, interest rate [1],[2],[4],[5] 11.40% 11.40% 11.40%        
Investment, principal [1],[4],[5],[7] $ 44,550            
Investment owned, at cost [1],[4],[5] 42,918            
Investments at fair value [1],[4],[5] $ 35,046            
Investment, Identifier [Axis]: INW Manufacturing, LLC, Personal Products, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       5.75% 5.75% 5.75%  
Investment, interest rate [8],[9],[10],[11]       9.42% 9.42% 9.42%  
Investment, principal [8],[9],[10],[12]       $ 35,625      
Investment owned, at cost [8],[9],[10]       34,806      
Investments at fair value [8],[9],[10]       $ 31,528      
Investment, Identifier [Axis]: IPC Corp., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% [1],[4],[5] 6.50% [1],[4],[5] 6.50% [1],[4],[5] 6.50% [8],[9],[10] 6.50% [8],[9],[10] 6.50% [8],[9],[10]  
Investment, interest rate 11.92% [1],[2],[4],[5] 11.92% [1],[2],[4],[5] 11.92% [1],[2],[4],[5] 9.44% [8],[9],[10],[11] 9.44% [8],[9],[10],[11] 9.44% [8],[9],[10],[11]  
Investment, principal $ 40,587 [1],[4],[5],[7]     $ 34,357 [8],[9],[10],[12]      
Investment owned, at cost 39,935 [1],[4],[5]     33,612 [8],[9],[10]      
Investments at fair value $ 38,963 [1],[4],[5]     $ 32,639 [8],[9],[10]      
Investment, Identifier [Axis]: Immucor, Inc., Health Care Supplies, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       5.75% 5.75% 5.75%  
Investment, interest rate [8],[9],[10],[11]       9.42% 9.42% 9.42%  
Investment, principal [8],[9],[10],[12]       $ 8,569      
Investment owned, at cost [8],[9],[10]       8,401      
Investments at fair value [8],[9],[10]       $ 8,407      
Investment, Identifier [Axis]: Immucor, Inc., Health Care Supplies, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.00% 8.00% 8.00%  
Investment, interest rate [8],[9],[10],[11]       11.67% 11.67% 11.67%  
Investment, principal [8],[9],[10],[12]       $ 22,619      
Investment owned, at cost [8],[9],[10]       22,162      
Investments at fair value [8],[9],[10]       22,275      
Investment, Identifier [Axis]: Impel Neuropharma, Inc., Health Care Technology, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [8],[9],[12],[22]       13,083      
Investment owned, at cost [8],[9],[22]       13,083      
Investments at fair value [8],[9],[22]       $ 13,083      
Investment, Identifier [Axis]: Impel Neuropharma, Inc., Health Care Technology, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.75% 8.75% 8.75%  
Investment, interest rate [8],[9],[10],[11]       12.45% 12.45% 12.45%  
Investment, principal [8],[9],[10],[12]       $ 12,161      
Investment owned, at cost [8],[9],[10]       11,944      
Investments at fair value [8],[9],[10]       $ 11,942      
Investment, Identifier [Axis]: Impel Pharmaceuticals Inc., Health Care Technology, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 350,241 350,241 350,241        
Investment owned, at cost $ 0            
Investments at fair value $ 147            
Investment, Identifier [Axis]: Impel Pharmaceuticals Inc., Health Care Technology, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 10.75% 10.75% 10.75%        
Investment, principal [1],[3],[4],[5],[7] $ 688            
Investment owned, at cost [1],[3],[4],[5] 688            
Investments at fair value [1],[3],[4],[5] $ 688            
Investment, Identifier [Axis]: Impel Pharmaceuticals Inc., Health Care Technology, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 10.75% 10.75% 10.75%        
Investment, principal [1],[4],[5],[7] $ 26,613            
Investment owned, at cost [1],[4],[5] 26,492            
Investments at fair value [1],[4],[5] $ 24,484            
Investment, Identifier [Axis]: Impel Pharmaceuticals Inc., Health Care Technology, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 10.75% 10.75% 10.75%        
Investment, principal [1],[4],[5],[7] $ 787            
Investment owned, at cost [1],[4],[5] 771            
Investments at fair value [1],[4],[5] $ 787            
Investment, Identifier [Axis]: Indivior Finance S.À.R.L., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.90% 10.90% 10.90% 8.80% 8.80% 8.80%  
Investment, principal $ 7,331     $ 7,406      
Investment owned, at cost 7,249     7,293      
Investments at fair value $ 7,340     $ 7,286      
Investment, Identifier [Axis]: Indivior Finance S.À.R.L., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.90% 10.90% 10.90% 8.80% 8.80% 8.80%  
Investment, principal $ 3,910     $ 3,950      
Investment owned, at cost 3,866     3,890      
Investments at fair value $ 3,915     $ 3,886      
Investment, Identifier [Axis]: Innocoll Pharmaceuticals Limited, Health Care Technology, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[5],[14] 5.75% 5.75% 5.75%        
Investment, interest rate 11.14% [1],[2],[5],[14] 11.14% [1],[2],[5],[14] 11.14% [1],[2],[5],[14] 11.00% [8],[9],[10],[11],[16] 11.00% [8],[9],[10],[11],[16] 11.00% [8],[9],[10],[11],[16]  
Investment, principal $ 7,179 [1],[5],[7],[14]     $ 6,817 [8],[9],[12],[16]      
Investment owned, at cost 6,969 [1],[5],[14]     6,553 [8],[9],[16]      
Investments at fair value $ 6,568 [1],[5],[14]     $ 6,408 [8],[9],[16]      
Investment, Identifier [Axis]: Innocoll Pharmaceuticals Limited, Health Care Technology, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [8],[9],[10],[11],[13],[16]       11.00% 11.00% 11.00%  
Investment, principal [8],[9],[12],[13],[16]       $ 0      
Investment owned, at cost [8],[9],[13],[16]       0      
Investments at fair value [8],[9],[13],[16]       $ 0      
Investment, Identifier [Axis]: Innocoll Pharmaceuticals Limited, Health Care Technology, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 112,990 [1],[4],[14] 112,990 [1],[4],[14] 112,990 [1],[4],[14] 56,999 [8],[9],[16] 56,999 [8],[9],[16] 56,999 [8],[9],[16]  
Investment owned, at cost $ 300 [1],[4],[14]     $ 135 [8],[9],[16]      
Investments at fair value $ 105 [1],[4],[14]     $ 609 [8],[9],[16]      
Investment, Identifier [Axis]: Integral Development Corporation, Diversified Financial Services, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 1,078,284 1,078,284 1,078,284        
Investment owned, at cost [1],[4] $ 113            
Investments at fair value [1],[4] $ 0            
Investment, Identifier [Axis]: Integral Development Corporation, Other Diversified Financial Services, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       1,078,284 1,078,284 1,078,284  
Investment owned, at cost [8],[9]       $ 113      
Investments at fair value [8],[9]       $ 0      
Investment, Identifier [Axis]: Inventus Power, Inc., Electrical Components & Equipment, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.50% 7.50% 7.50%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (99)            
Investments at fair value [1],[3],[4],[5] $ (86)            
Investment, Identifier [Axis]: Inventus Power, Inc., Electrical Components & Equipment, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% [1],[4],[5] 7.50% [1],[4],[5] 7.50% [1],[4],[5] 5.00% [8],[9],[10] 5.00% [8],[9],[10] 5.00% [8],[9],[10]  
Investment, interest rate 12.93% [1],[2],[4],[5] 12.93% [1],[2],[4],[5] 12.93% [1],[2],[4],[5] 8.55% [8],[9],[10],[11] 8.55% [8],[9],[10],[11] 8.55% [8],[9],[10],[11]  
Investment, principal $ 33,414 [1],[4],[5],[7]     $ 18,660 [8],[9],[10],[12]      
Investment owned, at cost 32,539 [1],[4],[5]     18,567 [8],[9],[10]      
Investments at fair value $ 32,659 [1],[4],[5]     $ 18,134 [8],[9],[10]      
Investment, Identifier [Axis]: Inventus Power, Inc., Electrical Components & Equipment, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.50% 8.50% 8.50%  
Investment, interest rate [8],[9],[10],[11]       12.17% 12.17% 12.17%  
Investment, principal [8],[9],[10],[12]       $ 13,674      
Investment owned, at cost [8],[9],[10]       13,514      
Investments at fair value [8],[9],[10]       $ 13,154      
Investment, Identifier [Axis]: Iris Holding, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.75% 4.75% 4.75%  
Investment, interest rate       7.89% 7.89% 7.89%  
Investment, principal       $ 5,000      
Investment owned, at cost       4,624      
Investments at fair value       $ 4,610      
Investment, Identifier [Axis]: Iris Holding, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 4.75% 4.75% 4.75%  
Investment, interest rate 10.32% 10.32% 10.32% 7.89% 7.89% 7.89%  
Investment, principal $ 4,500     $ 2,000      
Investment owned, at cost 4,350     1,846      
Investments at fair value $ 4,349     $ 1,844      
Investment, Identifier [Axis]: Ivanti Software, Inc., Application Software, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.25% [4],[5] 7.25% [4],[5] 7.25% [4],[5] 7.25% [9],[10] 7.25% [9],[10] 7.25% [9],[10]  
Investment, interest rate 12.78% [2],[4],[5] 12.78% [2],[4],[5] 12.78% [2],[4],[5] 10.33% [9],[10],[11] 10.33% [9],[10],[11] 10.33% [9],[10],[11]  
Investment, principal $ 13,939 [4],[5],[7]     $ 10,247 [9],[10],[12]      
Investment owned, at cost 12,661 [4],[5]     10,196 [9],[10]      
Investments at fair value 10,094 [4],[5]     $ 7,702 [9],[10]      
Investment, Identifier [Axis]: JP Morgan Prime Money Market Fund, Institutional Shares              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, at cost 83,262            
Investments at fair value $ 83,262            
Investment, Identifier [Axis]: Jazz Acquisition, Inc., Aerospace & Defense, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.50% 7.50% 7.50%  
Investment, interest rate [8],[9],[10],[11]       10.62% 10.62% 10.62%  
Investment, principal [8],[9],[10],[12]       $ 36,234      
Investment owned, at cost [8],[9],[10]       35,170      
Investments at fair value [8],[9],[10]       $ 36,392      
Investment, Identifier [Axis]: Jazz Acquisition, Inc., Aerospace & Defense, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       8.00% 8.00% 8.00%  
Investment, interest rate [9],[10],[11]       11.12% 11.12% 11.12%  
Investment, principal [9],[10],[12]       $ 528      
Investment owned, at cost [9],[10]       478      
Investments at fair value [9],[10]       $ 481      
Investment, Identifier [Axis]: KDC/ONE Development Corp Inc, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00%        
Investment, interest rate 10.32% 10.32% 10.32%        
Investment, principal $ 10,000            
Investment owned, at cost 9,666            
Investments at fair value $ 9,665            
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       6.50% 6.50% 6.50%  
Investment, interest rate [8],[9],[10],[11],[13]       10.17% 10.17% 10.17%  
Investment, principal [8],[9],[10],[12],[13]       $ 329      
Investment owned, at cost [8],[9],[10],[13]       311      
Investments at fair value [8],[9],[10],[13]       $ 292      
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Revolver 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[3],[4],[5] 11.84% 11.84% 11.84%        
Investment, principal [1],[3],[4],[5],[7] $ 272            
Investment owned, at cost [1],[3],[4],[5] 246            
Investments at fair value [1],[3],[4],[5] $ 238            
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Revolver 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 6.50% 6.50% 6.50%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (47)            
Investments at fair value [1],[3],[4],[5] $ (47)            
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.50% 6.50% 6.50%  
Investment, interest rate [8],[9],[10],[11]       10.17% 10.17% 10.17%  
Investment, principal [8],[9],[10],[12]       $ 13,623      
Investment owned, at cost [8],[9],[10]       13,487      
Investments at fair value [8],[9],[10]       $ 13,351      
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 11.84% 11.84% 11.84%        
Investment, principal [1],[4],[5],[7] $ 16,752            
Investment owned, at cost [1],[4],[5] 16,623            
Investments at fair value [1],[4],[5] $ 16,500            
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.50% 6.50% 6.50%        
Investment, interest rate [1],[2],[4],[5] 11.80% 11.80% 11.80%        
Investment, principal [1],[4],[5],[7] $ 38,015            
Investment owned, at cost [1],[4],[5] 37,447            
Investments at fair value [1],[4],[5] $ 37,445            
Investment, Identifier [Axis]: LABL, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00%        
Investment, interest rate 10.42% 10.42% 10.42%        
Investment, principal $ 3,962            
Investment owned, at cost 3,815            
Investments at fair value $ 3,955            
Investment, Identifier [Axis]: LSL Holdco, LLC, Health Care Distributors, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[3],[4],[5] 6.00% [1],[3],[4],[5] 6.00% [1],[3],[4],[5] 6.00% [8],[9],[10],[13] 6.00% [8],[9],[10],[13] 6.00% [8],[9],[10],[13]  
Investment, interest rate [8],[9],[10],[11],[13]       9.12% 9.12% 9.12%  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 1,710 [8],[9],[10],[12],[13]      
Investment owned, at cost (41) [1],[3],[4],[5]     1,672 [8],[9],[10],[13]      
Investments at fair value $ (172) [1],[3],[4],[5]     $ 1,651 [8],[9],[10],[13]      
Investment, Identifier [Axis]: LSL Holdco, LLC, Health Care Distributors, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.00% 6.00% 6.00%  
Investment, interest rate [8],[9],[10],[11]       9.12% 9.12% 9.12%  
Investment, principal [8],[9],[10],[12]       $ 19,236      
Investment owned, at cost [8],[9],[10]       18,894      
Investments at fair value [8],[9],[10]       $ 18,707      
Investment, Identifier [Axis]: LSL Holdco, LLC, Health Care Distributors, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[4],[5] 11.42% 11.42% 11.42%        
Investment, principal [1],[4],[5],[7] $ 2,736            
Investment owned, at cost [1],[4],[5] 2,595            
Investments at fair value [1],[4],[5] $ 2,558            
Investment, Identifier [Axis]: LSL Holdco, LLC, Health Care Distributors, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[4],[5] 11.42% 11.42% 11.42%        
Investment, principal [1],[4],[5],[7] $ 23,494            
Investment owned, at cost [1],[4],[5] 23,128            
Investments at fair value [1],[4],[5] 21,967            
Investment, Identifier [Axis]: LTI Holdings, Inc., Electronic Components, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       6.75% 6.75% 6.75%  
Investment, interest rate [9],[10],[11]       9.87% 9.87% 9.87%  
Investment, principal [9],[10],[12]       $ 2,140      
Investment owned, at cost [9],[10]       2,092      
Investments at fair value [9],[10]       $ 1,890      
Investment, Identifier [Axis]: LTI Holdings, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.25% 3.25% 3.25%  
Investment, interest rate       6.37% 6.37% 6.37%  
Investment, principal       $ 7,366      
Investment owned, at cost       7,282      
Investments at fair value       $ 6,835      
Investment, Identifier [Axis]: LTI Holdings, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.25% 3.25% 3.25%  
Investment, interest rate       6.37% 6.37% 6.37%  
Investment, principal       $ 1,358      
Investment owned, at cost       1,192      
Investments at fair value       1,260      
Investment, Identifier [Axis]: Largest Exposure To A Single Borrower | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal 11,286     10,093      
Investment, Identifier [Axis]: Largest Loan Exposure To A Single Borrower | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal $ 6,230     $ 6,562      
Investment, Identifier [Axis]: LaserAway Intermediate Holdings II, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Investment, interest rate 11.32% 11.32% 11.32% 8.23% 8.23% 8.23%  
Investment, principal $ 7,369     $ 7,444      
Investment owned, at cost 7,269     7,318      
Investments at fair value $ 7,267     $ 7,323      
Investment, Identifier [Axis]: LaserAway Intermediate Holdings II, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Investment, interest rate 11.32% 11.32% 11.32% 8.23% 8.23% 8.23%  
Investment, principal $ 3,930     $ 3,970      
Investment owned, at cost 3,877     3,903      
Investments at fair value $ 3,876     $ 3,905      
Investment, Identifier [Axis]: LaserShip, Inc., Air Freight & Logistics, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.50% 7.50% 7.50%  
Investment, interest rate [8],[9],[10],[11]       10.38% 10.38% 10.38%  
Investment, principal [8],[9],[10],[12]       $ 2,394      
Investment owned, at cost [8],[9],[10]       2,370      
Investments at fair value [8],[9],[10]       $ 1,867      
Investment, Identifier [Axis]: Latam Airlines Group S.A., Passenger Airlines, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [4],[5],[14] 9.50% 9.50% 9.50%        
Investment, interest rate [2],[4],[5],[14] 14.95% 14.95% 14.95%        
Investment, principal [4],[5],[7],[14] $ 26,422            
Investment owned, at cost [4],[5],[14] 24,920            
Investments at fair value [4],[5],[14] $ 27,512            
Investment, Identifier [Axis]: Lift Brands Holdings, Inc., Leisure Facilities, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 2,000,000 [1],[4] 2,000,000 [1],[4] 2,000,000 [1],[4] 2,000,000 [8],[9] 2,000,000 [8],[9] 2,000,000 [8],[9]  
Investment owned, at cost $ 1,399 [1],[4]     $ 1,399 [8],[9]      
Investments at fair value $ 0 [1],[4]     $ 0 [8],[9]      
Investment, Identifier [Axis]: Lightbox Intermediate, L.P., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.65% 10.65% 10.65% 8.67% 8.67% 8.67%  
Investment, principal $ 11,249     $ 7,367      
Investment owned, at cost 11,106     7,315      
Investments at fair value $ 10,912     $ 7,109      
Investment, Identifier [Axis]: Lightbox Intermediate, L.P., Real Estate Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% [1],[4],[5] 5.00% [1],[4],[5] 5.00% [1],[4],[5] 5.00% [8],[9],[10] 5.00% [8],[9],[10] 5.00% [8],[9],[10]  
Investment, interest rate 10.65% [1],[2],[4],[5] 10.65% [1],[2],[4],[5] 10.65% [1],[2],[4],[5] 8.67% [8],[9],[10],[11] 8.67% [8],[9],[10],[11] 8.67% [8],[9],[10],[11]  
Investment, principal $ 45,243 [1],[4],[5],[7]     $ 41,008 [8],[9],[10],[12]      
Investment owned, at cost 44,717 [1],[4],[5]     40,243 [8],[9],[10]      
Investments at fair value $ 43,886 [1],[4],[5]     $ 39,573 [8],[9],[10]      
Investment, Identifier [Axis]: Liquid Environmental Solutions Corporation, Environmental & Facilities Services, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 559 [1],[4] 559 [1],[4] 559 [1],[4] 451 [8],[9] 451 [8],[9] 451 [8],[9]  
Investment, principal [1],[4],[7]            
Investment owned, at cost 563 [1],[4]     $ 451 [8],[9]      
Investments at fair value $ 372 [1],[4]     $ 451 [8],[9]      
Investment, Identifier [Axis]: Liquid Environmental Solutions Corporation, Environmental & Facilities Services, Second Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [8],[9],[10] 8.50% [8],[9],[10] 8.50% [8],[9],[10]  
Investment, interest rate 13.99% [1],[2],[4],[5] 13.99% [1],[2],[4],[5] 13.99% [1],[2],[4],[5] 11.38% [8],[9],[10],[11] 11.38% [8],[9],[10],[11] 11.38% [8],[9],[10],[11]  
Investment, principal $ 5,403 [1],[4],[5],[7]     $ 4,357 [8],[9],[10],[12]      
Investment owned, at cost 5,348 [1],[4],[5]     4,285 [8],[9],[10]      
Investments at fair value $ 5,160 [1],[4],[5]     $ 4,226 [8],[9],[10]      
Investment, Identifier [Axis]: Liquid Environmental Solutions Corporation, Environmental & Facilities Services, Second Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.50% [1],[3],[4],[5] 8.50% [1],[3],[4],[5] 8.50% [1],[3],[4],[5] 8.50% [8],[9],[10],[13] 8.50% [8],[9],[10],[13] 8.50% [8],[9],[10],[13]  
Investment, interest rate 13.99% [1],[2],[3],[4],[5] 13.99% [1],[2],[3],[4],[5] 13.99% [1],[2],[3],[4],[5] 11.38% [8],[9],[10],[11],[13] 11.38% [8],[9],[10],[11],[13] 11.38% [8],[9],[10],[11],[13]  
Investment, principal $ 2,939 [1],[3],[4],[5],[7]     $ 2,370 [8],[9],[10],[12],[13]      
Investment owned, at cost 2,884 [1],[3],[4],[5]     2,323 [8],[9],[10],[13]      
Investments at fair value $ 2,745 [1],[3],[4],[5]     $ 2,265 [8],[9],[10],[13]      
Investment, Identifier [Axis]: LogMeIn, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.75% 4.75% 4.75%  
Investment, interest rate       7.80% 7.80% 7.80%  
Investment, principal       $ 7,860      
Investment owned, at cost       7,751      
Investments at fair value       $ 5,494      
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Diversified Support Services, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[3],[4],[5] 6.00% [1],[3],[4],[5] 6.00% [1],[3],[4],[5] 6.00% [8],[9],[10],[13] 6.00% [8],[9],[10],[13] 6.00% [8],[9],[10],[13]  
Investment, interest rate [1],[2],[3],[4],[5] 11.42% 11.42% 11.42%        
Investment, principal $ 964 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost 936 [1],[3],[4],[5]     (23) [8],[9],[10],[13]      
Investments at fair value $ 938 [1],[3],[4],[5]     $ (54) [8],[9],[10],[13]      
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Diversified Support Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.00% 6.00% 6.00%  
Investment, interest rate [8],[9],[10],[11]       9.50% 9.50% 9.50%  
Investment, principal [8],[9],[10],[12]       $ 18,390      
Investment owned, at cost [8],[9],[10]       18,088      
Investments at fair value [8],[9],[10]       $ 17,691      
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Diversified Support Services, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[4],[5] 11.52% 11.52% 11.52%        
Investment, principal [1],[4],[5],[7] $ 20,125            
Investment owned, at cost [1],[4],[5] 19,912            
Investments at fair value [1],[4],[5] $ 19,823            
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Diversified Support Services, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[4],[5] 11.52% 11.52% 11.52%        
Investment, principal [1],[4],[5],[7] $ 2,631            
Investment owned, at cost [1],[4],[5] 2,587            
Investments at fair value [1],[4],[5] $ 2,591            
Investment, Identifier [Axis]: MND Holdings III Corp, Other Specialty Retail, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.50% 7.50% 7.50%        
Investment, interest rate [1],[2],[3],[4],[5] 12.83% 12.83% 12.83%        
Investment, principal [1],[3],[4],[5],[7] $ 1,466            
Investment owned, at cost [1],[3],[4],[5] 1,215            
Investments at fair value [1],[3],[4],[5] $ 1,282            
Investment, Identifier [Axis]: MND Holdings III Corp, Other Specialty Retail, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.50% 7.50% 7.50%        
Investment, interest rate [1],[2],[4],[5] 12.89% 12.89% 12.89%        
Investment, principal [1],[4],[5],[7] $ 40,538            
Investment owned, at cost [1],[4],[5] 39,873            
Investments at fair value [1],[4],[5] $ 39,833            
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% [1],[3],[4],[5] 5.50% [1],[3],[4],[5] 5.50% [1],[3],[4],[5] 5.50% [8],[9],[10],[13] 5.50% [8],[9],[10],[13] 5.50% [8],[9],[10],[13]  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost (28) [1],[3],[4],[5]     (13) [8],[9],[10],[13]      
Investments at fair value $ (47) [1],[3],[4],[5]     $ (51) [8],[9],[10],[13]      
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% [1],[4],[5] 5.50% [1],[4],[5] 5.50% [1],[4],[5] 5.50% [8],[9],[10] 5.50% [8],[9],[10] 5.50% [8],[9],[10]  
Investment, interest rate 10.99% [1],[2],[4],[5] 10.99% [1],[2],[4],[5] 10.99% [1],[2],[4],[5] 9.17% [8],[9],[10],[11] 9.17% [8],[9],[10],[11] 9.17% [8],[9],[10],[11]  
Investment, principal $ 13,973 [1],[4],[5],[7]     $ 29,565 [8],[9],[10],[12]      
Investment owned, at cost 13,936 [1],[4],[5]     29,128 [8],[9],[10]      
Investments at fair value $ 13,685 [1],[4],[5]     $ 28,734 [8],[9],[10]      
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% [1],[4],[5] 5.50% [1],[4],[5] 5.50% [1],[4],[5] 5.50% [8],[9],[10],[13] 5.50% [8],[9],[10],[13] 5.50% [8],[9],[10],[13]  
Investment, interest rate [1],[2],[4],[5] 10.99% 10.99% 10.99%        
Investment, principal $ 21,328 [1],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost 21,021 [1],[4],[5]     (12) [8],[9],[10],[13]      
Investments at fair value $ 20,888 [1],[4],[5]     $ (96) [8],[9],[10],[13]      
Investment, Identifier [Axis]: MRI Software LLC, First Lien Revolver | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Investment, principal $ 0          
Investment owned, at cost (3)     (3)      
Investments at fair value $ (7)     $ (10)      
Investment, Identifier [Axis]: MRI Software LLC, First Lien Revolver | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Investment, principal $ 0     $ 0      
Investment owned, at cost (1)     (1)      
Investments at fair value $ (3)     $ (4)      
Investment, Identifier [Axis]: MRI Software LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       5.50% 5.50% 5.50%  
Investment, interest rate       9.17% 9.17% 9.17%  
Investment, principal       $ 6,139      
Investment owned, at cost       6,104      
Investments at fair value       $ 5,966      
Investment, Identifier [Axis]: MRI Software LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Investment, interest rate 10.99% 10.99% 10.99% 9.17% 9.17% 9.17%  
Investment, principal $ 1,630     $ 1,647      
Investment owned, at cost 1,616     1,632      
Investments at fair value $ 1,596     $ 1,600      
Investment, Identifier [Axis]: MRI Software LLC, First Lien Term Loan 1 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% 5.50% 5.50%        
Investment, interest rate 10.99% 10.99% 10.99%        
Investment, principal $ 8,319            
Investment owned, at cost 8,164            
Investments at fair value $ 8,147            
Investment, Identifier [Axis]: MRI Software LLC, First Lien Term Loan 2 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.50% 5.50% 5.50%        
Investment, interest rate 10.99% 10.99% 10.99%        
Investment, principal $ 2,211            
Investment owned, at cost 2,210            
Investments at fair value $ 2,165            
Investment, Identifier [Axis]: Marinus Pharmaceuticals, Inc., Pharmaceuticals, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 11.50% [1],[2],[4],[5],[14] 11.50% [1],[2],[4],[5],[14] 11.50% [1],[2],[4],[5],[14] 11.50% [8],[9],[10],[11],[16] 11.50% [8],[9],[10],[11],[16] 11.50% [8],[9],[10],[11],[16]  
Investment, principal $ 8,568 [1],[4],[7],[14]     $ 17,203 [8],[9],[12],[16]      
Investment owned, at cost 8,495 [1],[4],[14]     16,954 [8],[9],[16]      
Investments at fair value $ 8,132 [1],[4],[14]     $ 16,644 [8],[9],[16]      
Investment, Identifier [Axis]: Marinus Pharmaceuticals, Inc., Pharmaceuticals, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 11.50% [1],[2],[4],[5],[14] 11.50% [1],[2],[4],[5],[14] 11.50% [1],[2],[4],[5],[14] 11.50% [8],[9],[10],[11],[13],[16] 11.50% [8],[9],[10],[11],[13],[16] 11.50% [8],[9],[10],[11],[13],[16]  
Investment, principal $ 4,284 [1],[4],[7],[14]     $ 0 [8],[9],[12],[13],[16]      
Investment owned, at cost 4,247 [1],[4],[14]     0 [8],[9],[13],[16]      
Investments at fair value $ 4,066 [1],[4],[14]     $ 0 [8],[9],[13],[16]      
Investment, Identifier [Axis]: Marinus Pharmaceuticals, Inc., Pharmaceuticals, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 11.50% 11.50% 11.50%        
Investment, principal [1],[4],[7],[14] $ 8,568            
Investment owned, at cost [1],[4],[14] 8,495            
Investments at fair value [1],[4],[14] $ 8,132            
Investment, Identifier [Axis]: McAfee Corp., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.75% 3.75% 3.75%        
Investment, interest rate 9.18% 9.18% 9.18%        
Investment, principal $ 5,940            
Investment owned, at cost 5,654            
Investments at fair value $ 5,812            
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 8.00% [1],[2],[4],[5],[14] 8.00% [1],[2],[4],[5],[14] 8.00% [1],[2],[4],[5],[14] 8.00% [8],[9],[10],[11],[16] 8.00% [8],[9],[10],[11],[16] 8.00% [8],[9],[10],[11],[16]  
Investment, principal $ 9,106 [1],[4],[7],[14]     $ 7,215 [8],[9],[12],[16]      
Investment owned, at cost 8,580 [1],[4],[14]     6,650 [8],[9],[16]      
Investments at fair value $ 8,013 [1],[4],[14]     $ 6,440 [8],[9],[16]      
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [8],[9],[10],[11],[13],[16]       8.00% 8.00% 8.00%  
Investment, principal [8],[9],[12],[13],[16]       $ 0      
Investment owned, at cost [8],[9],[13],[16]       1      
Investments at fair value [8],[9],[13],[16]       $ 0      
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9],[16]       209,588 209,588 209,588  
Investment owned, at cost [8],[9],[16]       $ 480      
Investments at fair value [8],[9],[16]       $ 170      
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, Warrants 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4],[14] 259,877 259,877 259,877        
Investment, principal [1],[4],[7],[14]            
Investment owned, at cost [1],[4],[14] 545            
Investments at fair value [1],[4],[14] $ 78            
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, Warrants 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4],[14] 66,817 66,817 66,817        
Investment, principal [1],[4],[7],[14]            
Investment owned, at cost [1],[4],[14] 23            
Investments at fair value [1],[4],[14] $ 33            
Investment, Identifier [Axis]: Mindbody, Inc., First Lien Revolver | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% 7.00% 7.00% 8.00% 8.00% 8.00%  
Investment, principal $ 0     $ 0      
Investment owned, at cost (2)     (4)      
Investments at fair value $ (8)     $ (12)      
Investment, Identifier [Axis]: Mindbody, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Investment, interest rate 12.52% 12.52% 12.52% 10.64% 10.64% 10.64%  
Investment, principal $ 4,669     $ 4,687      
Investment owned, at cost 4,648     4,651      
Investments at fair value $ 4,594     $ 4,570      
Investment, Identifier [Axis]: Mindbody, Inc., Internet Services & Infrastructure, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[3],[4],[5] 7.00% [1],[3],[4],[5] 7.00% [1],[3],[4],[5] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13]  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost (43) [1],[3],[4],[5]     (54) [8],[9],[10],[13]      
Investments at fair value $ (76) [1],[3],[4],[5]     $ (100) [8],[9],[10],[13]      
Investment, Identifier [Axis]: Mindbody, Inc., Internet Services & Infrastructure, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11]       10.64% 10.64% 10.64%  
Investment, principal [8],[9],[10],[12]       $ 45,665      
Investment owned, at cost [8],[9],[10]       44,689      
Investments at fair value [8],[9],[10]       $ 44,523      
Investment, Identifier [Axis]: Mindbody, Inc., Internet Services & Infrastructure, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5] 12.52% 12.52% 12.52%        
Investment, principal [1],[4],[5],[7] $ 5,248            
Investment owned, at cost [1],[4],[5] 5,220            
Investments at fair value [1],[4],[5] $ 5,164            
Investment, Identifier [Axis]: Mindbody, Inc., Internet Services & Infrastructure, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5] 12.52% 12.52% 12.52%        
Investment, principal [1],[4],[5],[7] $ 46,687            
Investment owned, at cost [1],[4],[5] 46,239            
Investments at fair value [1],[4],[5] $ 45,940            
Investment, Identifier [Axis]: Mitchell International, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.75% 3.75% 3.75%        
Investment, interest rate 9.18% 9.18% 9.18%        
Investment, principal $ 2,985            
Investment owned, at cost 2,845            
Investments at fair value $ 2,941            
Investment, Identifier [Axis]: Mosaic Companies, LLC, Home Improvement Retail, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.75% [1],[4],[5] 6.75% [1],[4],[5] 6.75% [1],[4],[5] 6.75% [8],[9],[10] 6.75% [8],[9],[10] 6.75% [8],[9],[10]  
Investment, interest rate 12.51% [1],[2],[4],[5] 12.51% [1],[2],[4],[5] 12.51% [1],[2],[4],[5] 9.89% [8],[9],[10],[11] 9.89% [8],[9],[10],[11] 9.89% [8],[9],[10],[11]  
Investment, principal $ 54,559 [1],[4],[5],[7]     $ 46,499 [8],[9],[10],[12]      
Investment owned, at cost 54,236 [1],[4],[5]     45,802 [8],[9],[10]      
Investments at fair value $ 53,168 [1],[4],[5]     $ 45,421 [8],[9],[10]      
Investment, Identifier [Axis]: NFP Corp., Diversified Financial Services, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [2],[4],[5] 6.88% 6.88% 6.88%        
Investment, principal [4],[7] $ 10,191            
Investment owned, at cost [4] 9,831            
Investments at fair value [4] $ 8,743            
Investment, Identifier [Axis]: NFP Corp., Other Diversified Financial Services, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11]       6.88% 6.88% 6.88%  
Investment, principal [9],[12]       $ 10,191      
Investment owned, at cost [9]       9,773      
Investments at fair value [9]       $ 7,966      
Investment, Identifier [Axis]: NN, Inc., Industrial Machinery & Supplies & Components, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 6.88% 6.88% 6.88%        
Investment, interest rate [1],[2],[4],[5],[14] 12.29% 12.29% 12.29%        
Investment, principal [1],[4],[5],[7],[14] $ 73,362            
Investment owned, at cost [1],[4],[5],[14] 72,459            
Investments at fair value [1],[4],[5],[14] $ 69,694            
Investment, Identifier [Axis]: NN, Inc., Industrial Machinery & Supplies & Components, Warrants 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 487,870 487,870 487,870        
Investment owned, at cost [1],[4],[5],[14] $ 0            
Investments at fair value [4],[14] $ 903            
Investment, Identifier [Axis]: NN, Inc., Industrial Machinery & Supplies & Components, Warrants 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 487,870 487,870 487,870        
Investment owned, at cost [4],[5],[14] $ 0            
Investments at fair value [4],[14] $ 903            
Investment, Identifier [Axis]: NN, Inc., Industrial Machinery, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[16]       6.88% 6.88% 6.88%  
Investment, interest rate [8],[9],[10],[11],[16]       9.99% 9.99% 9.99%  
Investment, principal [8],[9],[10],[12],[16]       $ 58,713      
Investment owned, at cost [8],[9],[10],[16]       57,655      
Investments at fair value [8],[9],[10],[16]       $ 56,805      
Investment, Identifier [Axis]: Navisite, LLC, Data Processing & Outsourced Services, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [1],[4],[5] 8.50% [8],[9],[10] 8.50% [8],[9],[10] 8.50% [8],[9],[10]  
Investment, interest rate 13.99% [1],[2],[4],[5] 13.99% [1],[2],[4],[5] 13.99% [1],[2],[4],[5] 12.17% [8],[9],[10],[11] 12.17% [8],[9],[10],[11] 12.17% [8],[9],[10],[11]  
Investment, principal $ 30,339 [1],[4],[5],[7]     $ 22,560 [8],[9],[10],[12]      
Investment owned, at cost 30,021 [1],[4],[5]     22,241 [8],[9],[10]      
Investments at fair value $ 29,007 [1],[4],[5]     $ 21,524 [8],[9],[10]      
Investment, Identifier [Axis]: NeuAG, LLC, Fertilizers & Agricultural Chemicals, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 9.50% [1],[4],[5] 9.50% [1],[4],[5] 9.50% [1],[4],[5] 10.50% [8],[9],[10] 10.50% [8],[9],[10] 10.50% [8],[9],[10]  
Investment, interest rate 14.89% [1],[2],[4],[5] 14.89% [1],[2],[4],[5] 14.89% [1],[2],[4],[5] 14.17% [8],[9],[10],[11] 14.17% [8],[9],[10],[11] 14.17% [8],[9],[10],[11]  
Investment, principal $ 64,606 [1],[4],[5],[7]     $ 50,459 [8],[9],[10],[12]      
Investment owned, at cost 64,720 [1],[4],[5]     49,301 [8],[9],[10]      
Investments at fair value $ 63,185 [1],[4],[5]     $ 51,972 [8],[9],[10]      
Investment, Identifier [Axis]: Northern Star Industries Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.76% 4.76% 4.76% 4.75% 4.75% 4.75%  
Investment, interest rate 10.15% 10.15% 10.15% 7.87% 7.87% 7.87%  
Investment, principal $ 6,615     $ 6,685      
Investment owned, at cost 6,608     6,673      
Investments at fair value $ 6,565     $ 6,484      
Investment, Identifier [Axis]: Northern Star Industries Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.76% 4.76% 4.76% 4.75% 4.75% 4.75%  
Investment, interest rate 10.15% 10.15% 10.15% 7.87% 7.87% 7.87%  
Investment, principal $ 5,198     $ 5,252      
Investment owned, at cost 5,192     5,243      
Investments at fair value 5,159     5,095      
Investment, Identifier [Axis]: OCSI Glick JV LLC, Multi-Sector Holdings, Membership Interest              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, at cost 0 [3],[14],[26],[27]     0 [13],[16],[23],[24],[28],[29]      
Investments at fair value $ 0 [3],[14],[26],[27]     $ 0 [13],[16],[23],[24],[28],[29]     0
Investment, Identifier [Axis]: OCSI Glick JV LLC, Multi-Sector Holdings, Subordinated Debt              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.50% [1],[3],[5],[14],[26] 4.50% [1],[3],[5],[14],[26] 4.50% [1],[3],[5],[14],[26] 4.50% [8],[10],[13],[16],[23],[24],[28] 4.50% [8],[10],[13],[16],[23],[24],[28] 4.50% [8],[10],[13],[16],[23],[24],[28]  
Investment, interest rate 9.76% [1],[2],[3],[5],[14],[26] 9.76% [1],[2],[3],[5],[14],[26] 9.76% [1],[2],[3],[5],[14],[26] 6.30% [8],[10],[11],[13],[16],[23],[24],[28] 6.30% [8],[10],[11],[13],[16],[23],[24],[28] 6.30% [8],[10],[11],[13],[16],[23],[24],[28]  
Investment, principal $ 58,349 [1],[3],[5],[7],[14],[26]     $ 59,662 [8],[10],[12],[13],[16],[23],[24],[28]      
Investment owned, at cost 50,330 [1],[3],[5],[14],[26]     50,194 [8],[10],[13],[16],[23],[24],[28]      
Investments at fair value $ 50,017 [1],[3],[5],[14],[26]     $ 50,283 [8],[10],[13],[16],[23],[24],[28]     55,582
Investment, Identifier [Axis]: OEConnection LLC, Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       4.00% 4.00% 4.00%  
Investment, interest rate [9],[10],[11]       7.12% 7.12% 7.12%  
Investment, principal [9],[10],[12]       $ 3,323      
Investment owned, at cost [9],[10]       3,162      
Investments at fair value [9],[10]       $ 3,207      
Investment, Identifier [Axis]: OEConnection LLC, Application Software, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[4],[5] 7.00% [1],[4],[5] 7.00% [1],[4],[5] 7.00% [8],[9],[10] 7.00% [8],[9],[10] 7.00% [8],[9],[10]  
Investment, interest rate 12.49% [1],[2],[4],[5] 12.49% [1],[2],[4],[5] 12.49% [1],[2],[4],[5] 10.05% [8],[9],[10],[11] 10.05% [8],[9],[10],[11] 10.05% [8],[9],[10],[11]  
Investment, principal $ 9,323 [1],[4],[5],[7]     $ 7,519 [8],[9],[10],[12]      
Investment owned, at cost 9,210 [1],[4],[5]     7,389 [8],[9],[10]      
Investments at fair value $ 9,183 [1],[4],[5]     $ 7,237 [8],[9],[10]      
Investment, Identifier [Axis]: OEConnection LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%  
Investment, interest rate 9.43% 9.43% 9.43% 7.12% 7.12% 7.12%  
Investment, principal $ 10,987     $ 7,777      
Investment owned, at cost 10,827     7,741      
Investments at fair value $ 10,971     $ 7,505      
Investment, Identifier [Axis]: OEConnection LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%  
Investment, interest rate 9.43% 9.43% 9.43% 7.12% 7.12% 7.12%  
Investment, principal $ 3,849     $ 3,888      
Investment owned, at cost 3,830     3,871      
Investments at fair value $ 3,843     $ 3,752      
Investment, Identifier [Axis]: OTG Management, LLC, Airport Services, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 10.00% [1],[4],[5] 10.00% [1],[4],[5] 10.00% [1],[4],[5] 2.00% [8],[9],[10] 2.00% [8],[9],[10] 2.00% [8],[9],[10]  
Investment, interest rate [8],[9],[10],[11]       5.08% 5.08% 5.08%  
Investment, principal $ 25,712 [1],[4],[5],[7]     $ 21,557 [8],[9],[10],[12]      
Investment owned, at cost 25,615 [1],[4],[5]     21,267 [8],[9],[10]      
Investments at fair value $ 25,069 [1],[4],[5]     $ 21,557 [8],[9],[10]      
Investment, Identifier [Axis]: OTG Management, LLC, Airport Services, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 10.00% [1],[3],[4],[5] 10.00% [1],[3],[4],[5] 10.00% [1],[3],[4],[5] 2.00% [8],[9],[10],[13] 2.00% [8],[9],[10],[13] 2.00% [8],[9],[10],[13]  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost (11) [1],[3],[4],[5]     (31) [8],[9],[10],[13]      
Investments at fair value $ (69) [1],[3],[4],[5]     $ 0 [8],[9],[10],[13]      
Investment, Identifier [Axis]: OTG Management, LLC, Airport Services, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 10.00% 10.00% 10.00%        
Investment, principal [1],[3],[4],[5],[7] $ 1,210            
Investment owned, at cost [1],[3],[4],[5] 1,193            
Investments at fair value [1],[3],[4],[5] $ 1,169            
Investment, Identifier [Axis]: Oranje Holdco, Inc., Systems Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.75% 7.75% 7.75%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (42)            
Investments at fair value [1],[3],[4],[5] $ (36)            
Investment, Identifier [Axis]: Oranje Holdco, Inc., Systems Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.75% 7.75% 7.75%        
Investment, interest rate [1],[2],[4],[5] 13.12% 13.12% 13.12%        
Investment, principal [1],[4],[5],[7] $ 15,231            
Investment owned, at cost [1],[4],[5] 14,892            
Investments at fair value [1],[4],[5] 14,945            
Investment, Identifier [Axis]: Other cash accounts              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, at cost 62,277            
Investments at fair value $ 62,277            
Investment, Identifier [Axis]: P & L Development, LLC, Pharmaceuticals, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 7.75% [2],[4],[5] 7.75% [2],[4],[5] 7.75% [2],[4],[5] 7.75% [9],[10],[11] 7.75% [9],[10],[11] 7.75% [9],[10],[11]  
Investment, principal $ 4,519 [4],[7]     $ 7,776 [9],[12]      
Investment owned, at cost 4,550 [4]     7,820 [9]      
Investments at fair value $ 3,305 [4]     $ 5,846 [9]      
Investment, Identifier [Axis]: PFNY Holdings, LLC, Leisure Facilities, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       7.00% 7.00% 7.00%  
Investment, principal [8],[9],[10],[12],[13]       $ 0      
Investment owned, at cost [8],[9],[10],[13]       (21)      
Investments at fair value [8],[9],[10],[13]       $ (13)      
Investment, Identifier [Axis]: PFNY Holdings, LLC, Leisure Facilities, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11]       9.28% 9.28% 9.28%  
Investment, principal [8],[9],[10],[12]       $ 26,154      
Investment owned, at cost [8],[9],[10]       25,712      
Investments at fair value [8],[9],[10]       $ 25,893      
Investment, Identifier [Axis]: PFNY Holdings, LLC, Leisure Facilities, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[13]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11],[13]       9.25% 9.25% 9.25%  
Investment, principal [8],[9],[10],[12],[13]       $ 2,228      
Investment owned, at cost [8],[9],[10],[13]       2,186      
Investments at fair value [8],[9],[10],[13]       $ 2,203      
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Aerospace & Defense, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.00% 7.00% 7.00%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (53)            
Investments at fair value [1],[3],[4],[5] $ (54)            
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Aerospace & Defense, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5] 12.32% 12.32% 12.32%        
Investment, principal [1],[4],[5],[7] $ 10,895            
Investment owned, at cost [1],[4],[5] 10,505            
Investments at fair value [1],[4],[5] $ 10,495            
Investment, Identifier [Axis]: PRGX Global, Inc., Data Processing & Outsourced Services, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 100,000 [1],[4] 100,000 [1],[4] 100,000 [1],[4] 80,515 [8],[9] 80,515 [8],[9] 80,515 [8],[9]  
Investment owned, at cost $ 109 [1],[4]     $ 79 [8],[9]      
Investments at fair value $ 248 [1],[4]     $ 89 [8],[9]      
Investment, Identifier [Axis]: PRGX Global, Inc., Data Processing & Outsourced Services, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% [1],[3],[4],[5] 6.50% [1],[3],[4],[5] 6.50% [1],[3],[4],[5] 6.75% [8],[9],[10],[13] 6.75% [8],[9],[10],[13] 6.75% [8],[9],[10],[13]  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost (34) [1],[3],[4],[5]     (34) [8],[9],[10],[13]      
Investments at fair value $ (3) [1],[3],[4],[5]     $ (49) [8],[9],[10],[13]      
Investment, Identifier [Axis]: PRGX Global, Inc., Data Processing & Outsourced Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% [1],[4],[5] 6.50% [1],[4],[5] 6.50% [1],[4],[5] 6.75% [8],[9],[10] 6.75% [8],[9],[10] 6.75% [8],[9],[10]  
Investment, interest rate 12.01% [1],[2],[4],[5] 12.01% [1],[2],[4],[5] 12.01% [1],[2],[4],[5] 10.42% [8],[9],[10],[11] 10.42% [8],[9],[10],[11] 10.42% [8],[9],[10],[11]  
Investment, principal $ 38,414 [1],[4],[5],[7]     $ 33,775 [8],[9],[10],[12]      
Investment owned, at cost 37,960 [1],[4],[5]     32,931 [8],[9],[10]      
Investments at fair value $ 38,380 [1],[4],[5]     $ 33,116 [8],[9],[10]      
Investment, Identifier [Axis]: Park Place Technologies, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.42% 10.42% 10.42% 8.13% 8.13% 8.13%  
Investment, principal $ 9,825     $ 4,925      
Investment owned, at cost 9,492     4,781      
Investments at fair value $ 9,698     $ 4,687      
Investment, Identifier [Axis]: Park Place Technologies, LLC, Internet Services & Infrastructure, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% [4],[5] 5.00% [4],[5] 5.00% [4],[5] 5.00% [9],[10] 5.00% [9],[10] 5.00% [9],[10]  
Investment, interest rate 10.42% [2],[4],[5] 10.42% [2],[4],[5] 10.42% [2],[4],[5] 8.13% [9],[10],[11] 8.13% [9],[10],[11] 8.13% [9],[10],[11]  
Investment, principal $ 9,676 [4],[5],[7]     $ 9,850 [9],[10],[12]      
Investment owned, at cost 9,518 [4],[5]     9,460 [9],[10]      
Investments at fair value $ 9,551 [4],[5]     $ 9,374 [9],[10]      
Investment, Identifier [Axis]: Peloton Interactive, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       6.50% 6.50% 6.50%  
Investment, interest rate       8.35% 8.35% 8.35%  
Investment, principal       $ 5,486      
Investment owned, at cost       5,251      
Investments at fair value       $ 5,371      
Investment, Identifier [Axis]: Performance Health Holdings, Inc., Health Care Distributors, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[4],[5] 6.00% [1],[4],[5] 6.00% [1],[4],[5] 6.00% [8],[9],[10] 6.00% [8],[9],[10] 6.00% [8],[9],[10]  
Investment, interest rate 11.57% [1],[2],[4],[5] 11.57% [1],[2],[4],[5] 11.57% [1],[2],[4],[5] 8.88% [8],[9],[10],[11] 8.88% [8],[9],[10],[11] 8.88% [8],[9],[10],[11]  
Investment, principal $ 22,375 [1],[4],[5],[7]     $ 17,976 [8],[9],[10],[12]      
Investment owned, at cost 22,189 [1],[4],[5]     17,690 [8],[9],[10]      
Investments at fair value $ 21,896 [1],[4],[5]     $ 17,537 [8],[9],[10]      
Investment, Identifier [Axis]: Planview Parent, Inc., Application Software, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.25% [1],[4],[5] 7.25% [1],[4],[5] 7.25% [1],[4],[5] 7.25% [8],[9],[10] 7.25% [8],[9],[10] 7.25% [8],[9],[10]  
Investment, interest rate 12.74% [1],[2],[4],[5] 12.74% [1],[2],[4],[5] 12.74% [1],[2],[4],[5] 10.92% [8],[9],[10],[11] 10.92% [8],[9],[10],[11] 10.92% [8],[9],[10],[11]  
Investment, principal $ 36,499 [1],[4],[5],[7]     $ 28,627 [8],[9],[10],[12]      
Investment owned, at cost 35,458 [1],[4],[5]     28,198 [8],[9],[10]      
Investments at fair value $ 33,214 [1],[4],[5]     $ 27,482 [8],[9],[10]      
Investment, Identifier [Axis]: Planview Parent, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.65% 9.65% 9.65%        
Investment, principal $ 2,416            
Investment owned, at cost 2,298            
Investments at fair value $ 2,390            
Investment, Identifier [Axis]: Planview Parent, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.65% 9.65% 9.65%        
Investment, principal $ 683            
Investment owned, at cost 650            
Investments at fair value $ 676            
Investment, Identifier [Axis]: Planview Parent, Inc., Second Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Investment, interest rate 12.74% 12.74% 12.74% 10.92% 10.92% 10.92%  
Investment, principal $ 4,503     $ 4,503      
Investment owned, at cost 4,435     4,435      
Investments at fair value $ 4,098     $ 4,323      
Investment, Identifier [Axis]: Planview Parent, Inc., Second Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Investment, interest rate 12.74% 12.74% 12.74% 10.92% 10.92% 10.92%  
Investment, principal $ 2,842     $ 2,842      
Investment owned, at cost 2,799     2,799      
Investments at fair value $ 2,586     $ 2,728      
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [1],[3],[4],[5] 8.00% [1],[3],[4],[5] 8.00% [1],[3],[4],[5] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13] 8.00% [8],[9],[10],[13]  
Investment, interest rate [1],[2],[3],[4],[5] 13.45% 13.45% 13.45%        
Investment, principal $ 3,003 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost 2,926 [1],[3],[4],[5]     (53) [8],[9],[10],[13]      
Investments at fair value $ 2,801 [1],[3],[4],[5]     $ (111) [8],[9],[10],[13]      
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [1],[4],[5] 8.00% [1],[4],[5] 8.00% [1],[4],[5] 8.00% [8],[9],[10] 8.00% [8],[9],[10] 8.00% [8],[9],[10]  
Investment, interest rate 13.45% [1],[2],[4],[5] 13.45% [1],[2],[4],[5] 13.45% [1],[2],[4],[5] 10.68% [8],[9],[10],[11] 10.68% [8],[9],[10],[11] 10.68% [8],[9],[10],[11]  
Investment, principal $ 67,244 [1],[4],[5],[7]     $ 48,689 [8],[9],[10],[12]      
Investment owned, at cost 66,353 [1],[4],[5]     47,951 [8],[9],[10]      
Investments at fair value $ 64,406 [1],[4],[5]     $ 47,155 [8],[9],[10]      
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Revolver | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Investment, interest rate 13.45% 13.45% 13.45%        
Investment, principal $ 318     $ 0      
Investment owned, at cost 301     (6)      
Investments at fair value $ 297     $ (13)      
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Revolver | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Investment, interest rate 13.45% 13.45% 13.45%        
Investment, principal $ 226     $ 0      
Investment owned, at cost 216     (5)      
Investments at fair value $ 211     $ (10)      
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Investment, interest rate 13.45% 13.45% 13.45% 10.68% 10.68% 10.68%  
Investment, principal $ 8,116     $ 6,796      
Investment owned, at cost 7,850     6,694      
Investments at fair value $ 7,773     $ 6,582      
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Investment, interest rate 13.45% 13.45% 13.45% 10.68% 10.68% 10.68%  
Investment, principal $ 5,182     $ 4,465      
Investment owned, at cost 5,029     4,398      
Investments at fair value $ 4,964     $ 4,325      
Investment, Identifier [Axis]: Profrac Holdings II, LLC, Industrial Machinery & Supplies & Components, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[2],[4],[5] 12.78% 12.78% 12.78%        
Investment, principal [1],[4],[5],[7] $ 24,503            
Investment owned, at cost [1],[4],[5] 24,255            
Investments at fair value [1],[4],[5] $ 24,081            
Investment, Identifier [Axis]: Profrac Holdings II, LLC, Industrial Machinery & Supplies & Components, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[2],[4],[5] 12.78% 12.78% 12.78%        
Investment, principal [1],[4],[5],[7] $ 2,819            
Investment owned, at cost [1],[4],[5] 2,797            
Investments at fair value [1],[4],[5] $ 2,771            
Investment, Identifier [Axis]: Profrac Holdings II, LLC, Industrial Machinery, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.50% 8.50% 8.50%  
Investment, interest rate [8],[9],[10],[11]       10.01% 10.01% 10.01%  
Investment, principal [8],[9],[10],[12]       $ 23,275      
Investment owned, at cost [8],[9],[10]       22,722      
Investments at fair value [8],[9],[10]       $ 22,810      
Investment, Identifier [Axis]: Project Boost Purchaser, LLC, Application Software, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.00% 8.00% 8.00%  
Investment, interest rate [8],[9],[10],[11]       11.12% 11.12% 11.12%  
Investment, principal [8],[9],[10],[12]       $ 5,250      
Investment owned, at cost [8],[9],[10]       5,168      
Investments at fair value [8],[9],[10]       $ 5,047      
Investment, Identifier [Axis]: Quantum Bidco Limited, Food Distributors, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.75% [1],[4],[5],[14] 5.75% [1],[4],[5],[14] 5.75% [1],[4],[5],[14] 6.00% [8],[9],[10],[16] 6.00% [8],[9],[10],[16] 6.00% [8],[9],[10],[16]  
Investment, interest rate 11.21% [1],[2],[4],[5],[14] 11.21% [1],[2],[4],[5],[14] 11.21% [1],[2],[4],[5],[14] 8.39% [8],[9],[10],[11],[16] 8.39% [8],[9],[10],[11],[16] 8.39% [8],[9],[10],[11],[16]  
Investment, principal | £     £ 4,626 [1],[4],[5],[7],[14]     £ 3,501 [8],[9],[10],[12],[16]  
Investment owned, at cost $ 5,897 [1],[4],[5],[14]     $ 4,646 [8],[9],[10],[16]      
Investments at fair value $ 5,166 [1],[4],[5],[14]     $ 3,367 [8],[9],[10],[16]      
Investment, Identifier [Axis]: QuorumLabs, Inc., Application Software, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 64,887,669 [1],[4] 64,887,669 [1],[4] 64,887,669 [1],[4] 64,887,669 [8],[9] 64,887,669 [8],[9] 64,887,669 [8],[9]  
Investment owned, at cost $ 375 [1],[4]     $ 375 [8],[9]      
Investments at fair value $ 0 [1],[4]     $ 0 [8],[9]      
Investment, Identifier [Axis]: RP Escrow Issuer LLC, Health Care Distributors, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11]       5.25% 5.25% 5.25%  
Investment, principal [9],[12]       $ 1,325      
Investment owned, at cost [9]       1,218      
Investments at fair value [9]       $ 1,097      
Investment, Identifier [Axis]: Radiology Partners, Inc., Health Care Distributors, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       4.25% 4.25% 4.25%  
Investment, interest rate [9],[10],[11]       7.33% 7.33% 7.33%  
Investment, principal [9],[10],[12]       $ 3,400      
Investment owned, at cost [9],[10]       3,202      
Investments at fair value [9],[10]       $ 2,880      
Investment, Identifier [Axis]: Radiology Partners, Inc., Health Care Distributors, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11]       9.25% 9.25% 9.25%  
Investment, principal [9],[12]       $ 4,755      
Investment owned, at cost [9]       4,720      
Investments at fair value [9]       $ 3,109      
Investment, Identifier [Axis]: Relativity ODA LLC, Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% [1],[3],[4],[5] 6.50% [1],[3],[4],[5] 6.50% [1],[3],[4],[5] 6.50% [8],[9],[10],[13] 6.50% [8],[9],[10],[13] 6.50% [8],[9],[10],[13]  
Investment, principal $ 0 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost (43) [1],[3],[4],[5]     (43) [8],[9],[10],[13]      
Investments at fair value $ (47) [1],[3],[4],[5]     $ (64) [8],[9],[10],[13]      
Investment, Identifier [Axis]: Relativity ODA LLC, Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.50% [1],[4],[5] 6.50% [1],[4],[5] 6.50% [1],[4],[5] 7.50% [8],[9],[10] 7.50% [8],[9],[10] 7.50% [8],[9],[10]  
Investment, interest rate [1],[2],[4],[5] 11.92% 11.92% 11.92%        
Investment, principal $ 32,329 [1],[4],[5],[7]     $ 24,692 [8],[9],[10],[12]      
Investment owned, at cost 32,070 [1],[4],[5]     24,265 [8],[9],[10]      
Investments at fair value $ 31,779 [1],[4],[5]     $ 24,101 [8],[9],[10]      
Investment, Identifier [Axis]: Renaissance Holding Corp., Diversified Banks, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       7.00% 7.00% 7.00%  
Investment, interest rate [9],[10],[11]       10.12% 10.12% 10.12%  
Investment, principal [9],[10],[12]       $ 3,542      
Investment owned, at cost [9],[10]       3,515      
Investments at fair value [9],[10]       $ 3,402      
Investment, Identifier [Axis]: Renaissance Holding Corp., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.75% 4.75% 4.75%        
Investment, interest rate 9.99% 9.99% 9.99%        
Investment, principal $ 5,000            
Investment owned, at cost 4,860            
Investments at fair value $ 4,969            
Investment, Identifier [Axis]: RevSpring, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.00% 4.00% 4.00%  
Investment, interest rate       7.67% 7.67% 7.67%  
Investment, principal       $ 9,625      
Investment owned, at cost       9,607      
Investments at fair value       $ 9,304      
Investment, Identifier [Axis]: RumbleOn, Inc., Automotive Retail, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.25% [1],[4],[5],[14] 8.25% [1],[4],[5],[14] 8.25% [1],[4],[5],[14] 8.25% [8],[9],[10],[16] 8.25% [8],[9],[10],[16] 8.25% [8],[9],[10],[16]  
Investment, interest rate 13.90% [1],[2],[4],[5],[14] 13.90% [1],[2],[4],[5],[14] 13.90% [1],[2],[4],[5],[14] 11.92% [8],[9],[10],[11],[16] 11.92% [8],[9],[10],[11],[16] 11.92% [8],[9],[10],[11],[16]  
Investment, principal $ 36,707 [1],[4],[5],[7],[14]     $ 37,656 [8],[9],[10],[12],[16]      
Investment owned, at cost 35,548 [1],[4],[5],[14]     35,775 [8],[9],[10],[16]      
Investments at fair value $ 34,505 [1],[4],[5],[14]     $ 36,187 [8],[9],[10],[16]      
Investment, Identifier [Axis]: RumbleOn, Inc., Automotive Retail, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.25% [1],[4],[5],[14] 8.25% [1],[4],[5],[14] 8.25% [1],[4],[5],[14] 8.25% [8],[9],[10],[13],[16] 8.25% [8],[9],[10],[13],[16] 8.25% [8],[9],[10],[13],[16]  
Investment, interest rate 13.90% [1],[2],[4],[5],[14] 13.90% [1],[2],[4],[5],[14] 13.90% [1],[2],[4],[5],[14] 11.92% [8],[9],[10],[11],[13],[16] 11.92% [8],[9],[10],[11],[13],[16] 11.92% [8],[9],[10],[11],[13],[16]  
Investment, principal $ 13,504 [1],[4],[5],[7],[14]     $ 11,393 [8],[9],[10],[12],[13],[16]      
Investment owned, at cost 13,058 [1],[4],[5],[14]     10,583 [8],[9],[10],[13],[16]      
Investments at fair value $ 12,694 [1],[4],[5],[14]     $ 10,760 [8],[9],[10],[13],[16]      
Investment, Identifier [Axis]: RumbleOn, Inc., Automotive Retail, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 204,454 [1],[4],[14] 204,454 [1],[4],[14] 204,454 [1],[4],[14] 164,660 [8],[9],[16] 164,660 [8],[9],[16] 164,660 [8],[9],[16]  
Investment owned, at cost $ 1,202 [1],[4],[14]     $ 1,202 [8],[9],[16]      
Investments at fair value $ 756 [1],[4],[14]     $ 74 [8],[9],[16]      
Investment, Identifier [Axis]: SCP Eye Care Services, LLC, Health Care Services, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 1,037 1,037 1,037        
Investment owned, at cost [1],[4] $ 1,037            
Investments at fair value [1],[4] $ 951            
Investment, Identifier [Axis]: SCP Eye Care Services, LLC, Health Care Services, Second Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 8.75% 8.75% 8.75%        
Investment, interest rate [1],[2],[4],[5] 14.18% 14.18% 14.18%        
Investment, principal [1],[4],[5],[7] $ 8,010            
Investment owned, at cost [1],[4],[5] 7,799            
Investments at fair value [1],[4],[5] $ 7,778            
Investment, Identifier [Axis]: SCP Eye Care Services, LLC, Health Care Services, Second Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 8.75% 8.75% 8.75%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (35)            
Investments at fair value [1],[3],[4],[5] $ (68)            
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 1 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.23% 5.23% 5.23% 5.25% 5.25% 5.25%  
Investment, interest rate 10.86% 10.86% 10.86% 8.06% 8.06% 8.06%  
Investment, principal $ 138     $ 8,201      
Investment owned, at cost 138     8,194      
Investments at fair value $ 94     $ 7,176      
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 1 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.88% 10.88% 10.88% 8.06% 8.06% 8.06%  
Investment, principal $ 6,029     $ 6,094      
Investment owned, at cost 6,025     6,082      
Investments at fair value $ 4,110     $ 5,332      
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 2 | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.23% 5.23% 5.23%  
Investment, interest rate 10.88% 10.88% 10.88% 8.04% 8.04% 8.04%  
Investment, principal $ 8,113     $ 138      
Investment owned, at cost 8,111     138      
Investments at fair value $ 5,531     $ 121      
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 2 | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.23% 5.23% 5.23% 5.23% 5.23% 5.23%  
Investment, interest rate 10.86% 10.86% 10.86% 8.04% 8.04% 8.04%  
Investment, principal $ 103     $ 102      
Investment owned, at cost 102     102      
Investments at fair value 70     90      
Investment, Identifier [Axis]: SIO2 Medical Products, Inc, Metal, Glass & Plastic Containers, First Lien Delayed Draw Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal 15,874            
Investments at fair value $ 15,874     $ 0      
Investment, Identifier [Axis]: SIO2 Medical Products, Inc. Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1] 1,184,630 1,184,630 1,184,630        
Investment owned, at cost [1] $ 40,093            
Investments at fair value [1] $ 36,226            
Investment, Identifier [Axis]: SIO2 Medical Products, Inc. Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1] 66,686 66,686 66,686        
Investment owned, at cost [1] $ 0            
Investments at fair value [1] 0            
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [1],[7] 15,874            
Investment owned, at cost [1] 14,100            
Investments at fair value [1] 15,874            
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal [1],[3],[7] 1,359            
Investment owned, at cost [1],[3] 1,337            
Investments at fair value [1],[3] $ 1,359            
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal & Glass Containers, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       415 415 415  
Investment owned, at cost [8],[9]       $ 681      
Investments at fair value [8],[9]       681      
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 1,184,630 1,184,630 1,184,630        
Investments at fair value $ 36,226     0      
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Delayed Draw Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, principal 1,359            
Investments at fair value $ 1,359     0      
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 66,686 66,686 66,686        
Investments at fair value $ 0     $ 0      
Investment, Identifier [Axis]: SM Wellness Holdings, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.75% 4.75% 4.75%        
Investment, interest rate 10.38% 10.38% 10.38%        
Investment, principal $ 2,977            
Investment owned, at cost 2,580            
Investments at fair value $ 2,799            
Investment, Identifier [Axis]: SM Wellness Holdings, Inc., Health Care Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 4.75% 4.75% 4.75%        
Investment, interest rate [1],[2],[4],[5] 10.38% 10.38% 10.38%        
Investment, principal [1],[4],[5],[7] $ 4,452            
Investment owned, at cost [1],[4],[5] 3,806            
Investments at fair value [1],[4],[5] $ 4,184            
Investment, Identifier [Axis]: SM Wellness Holdings, Inc., Health Care Services, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [1],[4],[5] 8.00% [1],[4],[5] 8.00% [1],[4],[5] 8.00% [8],[9],[10] 8.00% [8],[9],[10] 8.00% [8],[9],[10]  
Investment, interest rate 13.63% [1],[2],[4],[5] 13.63% [1],[2],[4],[5] 13.63% [1],[2],[4],[5] 10.74% [8],[9],[10],[11] 10.74% [8],[9],[10],[11] 10.74% [8],[9],[10],[11]  
Investment, principal $ 12,034 [1],[4],[5],[7]     $ 9,109 [8],[9],[10],[12]      
Investment owned, at cost 11,250 [1],[4],[5]     8,972 [8],[9],[10]      
Investments at fair value $ 9,928 [1],[4],[5]     $ 8,289 [8],[9],[10]      
Investment, Identifier [Axis]: SPX Flow, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%  
Investment, interest rate 9.92% 9.92% 9.92% 7.63% 7.63% 7.63%  
Investment, principal $ 8,801     $ 7,500      
Investment owned, at cost 8,442     7,184      
Investments at fair value $ 8,794     $ 6,966      
Investment, Identifier [Axis]: SPX Flow, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%  
Investment, interest rate 9.92% 9.92% 9.92% 7.63% 7.63% 7.63%  
Investment, principal $ 5,227     $ 6,000      
Investment owned, at cost 5,032     5,734      
Investments at fair value $ 5,224     $ 5,572      
Investment, Identifier [Axis]: SPX Flow, Inc., Industrial Machinery, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       4.50% 4.50% 4.50%  
Investment, interest rate [9],[10],[11]       7.63% 7.63% 7.63%  
Investment, principal [9],[10],[12]       $ 1,500      
Investment owned, at cost [9],[10]       1,410      
Investments at fair value [9],[10]       $ 1,393      
Investment, Identifier [Axis]: SVP-Singer Holdings Inc., Home Furnishings, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.75% [1],[4],[5] 6.75% [1],[4],[5] 6.75% [1],[4],[5] 6.75% [8],[9],[10] 6.75% [8],[9],[10] 6.75% [8],[9],[10]  
Investment, interest rate 12.40% [1],[2],[4],[5] 12.40% [1],[2],[4],[5] 12.40% [1],[2],[4],[5] 10.42% [8],[9],[10],[11] 10.42% [8],[9],[10],[11] 10.42% [8],[9],[10],[11]  
Investment, principal $ 25,527 [1],[4],[5],[7]     $ 20,766 [8],[9],[10],[12]      
Investment owned, at cost 23,859 [1],[4],[5]     19,550 [8],[9],[10]      
Investments at fair value $ 19,954 [1],[4],[5]     $ 18,188 [8],[9],[10]      
Investment, Identifier [Axis]: Sabert Corporation, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.50% 4.50% 4.50%  
Investment, interest rate       7.63% 7.63% 7.63%  
Investment, principal       $ 2,536      
Investment owned, at cost       2,511      
Investments at fair value       $ 2,435      
Investment, Identifier [Axis]: Sabert Corporation, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.50% 4.50% 4.50%  
Investment, interest rate       7.63% 7.63% 7.63%  
Investment, principal       $ 1,691      
Investment owned, at cost       1,674      
Investments at fair value       $ 1,623      
Investment, Identifier [Axis]: Sabert Corporation, Metal & Glass Containers, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       4.50% 4.50% 4.50%  
Investment, interest rate [9],[10],[11]       7.63% 7.63% 7.63%  
Investment, principal [9],[10],[12]       $ 1,691      
Investment owned, at cost [9],[10]       1,610      
Investments at fair value [9],[10]       1,623      
Investment, Identifier [Axis]: Salus Workers' Compensation, LLC, Diversified Financial Services, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 10.00% 10.00% 10.00%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] (95)            
Investments at fair value [1],[3],[4],[5] $ (93)            
Investment, Identifier [Axis]: Salus Workers' Compensation, LLC, Diversified Financial Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 10.00% 10.00% 10.00%        
Investment, interest rate [1],[2],[4],[5] 15.24% 15.24% 15.24%        
Investment, principal [1],[4],[5],[7] $ 25,558            
Investment owned, at cost [1],[4],[5] 24,777            
Investments at fair value [1],[4],[5] $ 24,791            
Investment, Identifier [Axis]: Salus Workers' Compensation, LLC, Diversified Financial Services, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 991,019 991,019 991,019        
Investment owned, at cost [1],[4] $ 327            
Investments at fair value [1],[4] $ 1,625            
Investment, Identifier [Axis]: Scilex Holding Co, Biotechnology, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [4],[14] 9,307 9,307 9,307        
Investment owned, at cost [4],[14] $ 78            
Investments at fair value [4],[14] 13            
Investment, Identifier [Axis]: Senior Loan Fund JV I, LLC, Multi-Sector Holdings, Membership Interest              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, at cost 54,791 [3],[14],[26],[27],[30]     49,322 [13],[16],[23],[24],[28],[29],[31]      
Investments at fair value $ 28,878 [3],[14],[26],[27],[30]     $ 20,715 [13],[16],[23],[24],[28],[29],[31]     37,651
Investment, Identifier [Axis]: Senior Loan Fund JV I, LLC, Multi-Sector Holdings, Subordinated Debt              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[3],[5],[14],[26] 7.00% [1],[3],[5],[14],[26] 7.00% [1],[3],[5],[14],[26] 7.00% [8],[10],[13],[16],[23],[24],[28] 7.00% [8],[10],[13],[16],[23],[24],[28] 7.00% [8],[10],[13],[16],[23],[24],[28]  
Investment, interest rate 12.26% [1],[2],[3],[5],[14],[26] 12.26% [1],[2],[3],[5],[14],[26] 12.26% [1],[2],[3],[5],[14],[26] 8.80% [8],[10],[11],[13],[16],[23],[24],[28] 8.80% [8],[10],[11],[13],[16],[23],[24],[28] 8.80% [8],[10],[11],[13],[16],[23],[24],[28]  
Investment, principal $ 112,656 [1],[3],[5],[7],[14],[26]     $ 96,250 [8],[10],[12],[13],[16],[23],[24],[28]      
Investment owned, at cost 112,656 [1],[3],[5],[14],[26]     96,250 [8],[10],[13],[16],[23],[24],[28]      
Investments at fair value $ 112,656 [1],[3],[5],[14],[26]     $ 96,250 [8],[10],[13],[16],[23],[24],[28]     $ 96,250
Investment, Identifier [Axis]: Seres Therapeutics, Inc., Biotechnology, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 7.88% 7.88% 7.88%        
Investment, interest rate [1],[2],[4],[5],[14] 12.88% 12.88% 12.88%        
Investment, principal [1],[4],[5],[7],[14] $ 7,191            
Investment owned, at cost [1],[4],[5],[14] 6,934            
Investments at fair value [1],[4],[5],[14] $ 6,937            
Investment, Identifier [Axis]: Seres Therapeutics, Inc., Biotechnology, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 7.88% 7.88% 7.88%        
Investment, interest rate [1],[2],[4],[5],[14] 12.88% 12.88% 12.88%        
Investment, principal [1],[4],[5],[7],[14] $ 2,697            
Investment owned, at cost [1],[4],[5],[14] 2,601            
Investments at fair value [1],[4],[5],[14] $ 2,602            
Investment, Identifier [Axis]: Seres Therapeutics, Inc., Biotechnology, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5],[14] 7.88% 7.88% 7.88%        
Investment, principal [1],[3],[4],[5],[7],[14] $ 0            
Investment owned, at cost [1],[3],[4],[5],[14] 0            
Investments at fair value [1],[3],[4],[5],[14] $ 0            
Investment, Identifier [Axis]: Seres Therapeutics, Inc., Biotechnology, First Lien Term Loan 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5],[14] 7.88% 7.88% 7.88%        
Investment, principal [1],[3],[4],[5],[7],[14] $ 0            
Investment owned, at cost [1],[3],[4],[5],[14] 0            
Investments at fair value [1],[3],[4],[5],[14] $ 0            
Investment, Identifier [Axis]: Seres Therapeutics, Inc., Biotechnology, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4],[14] 58,210 58,210 58,210        
Investment owned, at cost [1],[4],[14] $ 182            
Investments at fair value [1],[4],[14] $ 87            
Investment, Identifier [Axis]: ShareThis, Inc., Application Software, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 345,452 [1],[4] 345,452 [1],[4] 345,452 [1],[4] 345,452 [8],[9] 345,452 [8],[9] 345,452 [8],[9]  
Investment owned, at cost $ 367 [1],[4]     $ 367 [8],[9]      
Investments at fair value $ 0 [1],[4]     $ 0 [8],[9]      
Investment, Identifier [Axis]: SiO2 Medical Products, Inc., Metal & Glass Containers, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [8],[9],[10],[11]       5.50% 5.50% 5.50%  
Investment, principal [8],[9],[12]       $ 46,121      
Investment owned, at cost [8],[9]       45,413      
Investments at fair value [8],[9]       $ 45,295      
Investment, Identifier [Axis]: SonicWall US Holdings Inc., Technology Distributors, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.50% [1],[4],[5] 7.50% [1],[4],[5] 7.50% [1],[4],[5] 7.50% [8],[9],[10] 7.50% [8],[9],[10] 7.50% [8],[9],[10]  
Investment, interest rate 13.04% [1],[2],[4],[5] 13.04% [1],[2],[4],[5] 13.04% [1],[2],[4],[5] 10.48% [8],[9],[10],[11] 10.48% [8],[9],[10],[11] 10.48% [8],[9],[10],[11]  
Investment, principal $ 821 [1],[4],[5],[7]     $ 3,195 [8],[9],[10],[12]      
Investment owned, at cost 813 [1],[4],[5]     3,163 [8],[9],[10]      
Investments at fair value $ 776 [1],[4],[5]     $ 2,997 [8],[9],[10]      
Investment, Identifier [Axis]: Sorenson Communications, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       5.50% 5.50% 5.50%  
Investment, interest rate       9.17% 9.17% 9.17%  
Investment, principal       $ 2,553      
Investment owned, at cost       2,528      
Investments at fair value       $ 2,454      
Investment, Identifier [Axis]: Sorrento Therapeutics, Inc., Biotechnology, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 66,000 [4],[14] 66,000 [4],[14] 66,000 [4],[14] 50,000 [9],[16] 50,000 [9],[16] 50,000 [9],[16]  
Investment owned, at cost $ 139 [4],[14]     $ 197 [9],[16]      
Investments at fair value $ 6 [4],[14]     $ 79 [9],[16]      
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.43% 9.43% 9.43%        
Investment, principal $ 3,292            
Investment owned, at cost 3,275            
Investments at fair value $ 3,276            
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.43% 9.43% 9.43%        
Investment, principal $ 7,680            
Investment owned, at cost 7,642            
Investments at fair value $ 7,643            
Investment, Identifier [Axis]: Spanx, LLC, Apparel Retail, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% [1],[3],[4],[5] 5.00% [1],[3],[4],[5] 5.00% [1],[3],[4],[5] 5.25% [8],[9],[10],[13] 5.25% [8],[9],[10],[13] 5.25% [8],[9],[10],[13]  
Investment, interest rate 10.42% [1],[2],[3],[4],[5] 10.42% [1],[2],[3],[4],[5] 10.42% [1],[2],[3],[4],[5] 8.03% [8],[9],[10],[11],[13] 8.03% [8],[9],[10],[11],[13] 8.03% [8],[9],[10],[11],[13]  
Investment, principal $ 618 [1],[3],[4],[5],[7]     $ 866 [8],[9],[10],[12],[13]      
Investment owned, at cost 576 [1],[3],[4],[5]     813 [8],[9],[10],[13]      
Investments at fair value $ 577 [1],[3],[4],[5]     $ 796 [8],[9],[10],[13]      
Investment, Identifier [Axis]: Spanx, LLC, Apparel Retail, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% [1],[4],[5] 5.25% [1],[4],[5] 5.25% [1],[4],[5] 5.25% [8],[9],[10] 5.25% [8],[9],[10] 5.25% [8],[9],[10]  
Investment, interest rate 10.67% [1],[2],[4],[5] 10.67% [1],[2],[4],[5] 10.67% [1],[2],[4],[5] 8.30% [8],[9],[10],[11] 8.30% [8],[9],[10],[11] 8.30% [8],[9],[10],[11]  
Investment, principal $ 4,488 [1],[4],[5],[7]     $ 4,534 [8],[9],[10],[12]      
Investment owned, at cost 4,423 [1],[4],[5]     4,455 [8],[9],[10]      
Investments at fair value $ 4,425 [1],[4],[5]     $ 4,427 [8],[9],[10]      
Investment, Identifier [Axis]: Spanx, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.67% 10.67% 10.67% 8.30% 8.30% 8.30%  
Investment, principal $ 8,843     $ 8,933      
Investment owned, at cost 8,713     8,776      
Investments at fair value $ 8,717     $ 8,721      
Investment, Identifier [Axis]: Spanx, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Investment, interest rate 10.67% 10.67% 10.67% 8.30% 8.30% 8.30%  
Investment, principal $ 4,913     $ 4,962      
Investment owned, at cost 4,840     4,876      
Investments at fair value $ 4,843     $ 4,845      
Investment, Identifier [Axis]: Star Parent, Inc. | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.33% 9.33% 9.33%        
Investment, principal $ 4,000            
Investment owned, at cost 3,939            
Investments at fair value $ 3,916            
Investment, Identifier [Axis]: Star Parent, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.00% 4.00% 4.00%        
Investment, interest rate 9.33% 9.33% 9.33%        
Investment, principal $ 8,000            
Investment owned, at cost 7,880            
Investments at fair value $ 7,834            
Investment, Identifier [Axis]: SumUp Holdings Luxembourg S.À.R.L., Diversified Financial Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 8.50% 8.50% 8.50%        
Investment, interest rate [1],[2],[4],[5],[14] 12.32% 12.32% 12.32%        
Investment, principal | € [1],[4],[5],[7],[14]   € 23,731          
Investment owned, at cost [1],[4],[5],[14] $ 26,772            
Investments at fair value [1],[4],[5],[14] $ 24,937            
Investment, Identifier [Axis]: SumUp Holdings Luxembourg S.À.R.L., Other Diversified Financial Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[16]       8.50% 8.50% 8.50%  
Investment, interest rate [8],[9],[10],[11],[16]       10.00% 10.00% 10.00%  
Investment, principal | £ [8],[9],[10],[12],[16]           £ 16,911  
Investment owned, at cost [8],[9],[10],[16]       $ 19,414      
Investments at fair value [8],[9],[10],[16]       $ 16,360      
Investment, Identifier [Axis]: Sunland Asphalt & Construction, LLC, Construction & Engineering, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.00% 6.00% 6.00%  
Investment, interest rate [8],[9],[10],[11]       8.88% 8.88% 8.88%  
Investment, principal [8],[9],[10],[12]       $ 42,618      
Investment owned, at cost [8],[9],[10]       41,654      
Investments at fair value [8],[9],[10]       $ 41,723      
Investment, Identifier [Axis]: Superior Industries International, Inc., Auto Parts & Equipment, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 8.00% 8.00% 8.00%        
Investment, interest rate [1],[2],[4],[5] 13.32% 13.32% 13.32%        
Investment, principal [1],[4],[5],[7] $ 49,520            
Investment owned, at cost [1],[4],[5] 48,536            
Investments at fair value [1],[4],[5] $ 49,148            
Investment, Identifier [Axis]: Supermoose Borrower, LLC, Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       3.75% 3.75% 3.75%  
Investment, interest rate [9],[10],[11]       7.42% 7.42% 7.42%  
Investment, principal [9],[10],[12]       $ 3,466      
Investment owned, at cost [9],[10]       3,141      
Investments at fair value [9],[10]       $ 3,056      
Investment, Identifier [Axis]: Supermoose Borrower, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.75% 3.75% 3.75%  
Investment, interest rate       7.42% 7.42% 7.42%  
Investment, principal       $ 7,743      
Investment owned, at cost       7,479      
Investments at fair value       $ 6,827      
Investment, Identifier [Axis]: Supermoose Borrower, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.75% 3.75% 3.75%  
Investment, interest rate       7.42% 7.42% 7.42%  
Investment, principal       $ 2,820      
Investment owned, at cost       2,712      
Investments at fair value       $ 2,487      
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[32] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5],[32] 12.44% 12.44% 12.44%        
Investment, principal [1],[4],[5],[7],[32] $ 1,552            
Investment owned, at cost [1],[4],[5],[32] 1,540            
Investments at fair value [1],[4],[5],[32] $ 1,478            
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[32] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5],[32] 12.51% 12.51% 12.51%        
Investment, principal [1],[4],[5],[7],[32] $ 32,104            
Investment owned, at cost [1],[4],[5],[32] 31,861            
Investments at fair value [1],[4],[5],[32] $ 30,579            
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[32] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[4],[5],[32] 12.51% 12.51% 12.51%        
Investment, principal [1],[4],[5],[7],[32] $ 2,749            
Investment owned, at cost [1],[4],[5],[32] 2,726            
Investments at fair value [1],[4],[5],[32] $ 2,618            
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5],[32] 7.00% 7.00% 7.00%        
Investment, interest rate [1],[2],[3],[4],[5],[32] 12.51% 12.51% 12.51%        
Investment, principal [1],[3],[4],[5],[7],[32] $ 1,099            
Investment owned, at cost [1],[3],[4],[5],[32] 1,062            
Investments at fair value [1],[3],[4],[5],[32] $ 943            
Investment, Identifier [Axis]: Surgery Center Holdings, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.75% 3.75% 3.75%  
Investment, interest rate       6.51% 6.51% 6.51%  
Investment, principal       $ 3,377      
Investment owned, at cost       3,365      
Investments at fair value       $ 3,213      
Investment, Identifier [Axis]: Surgery Center Holdings, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.75% 3.75% 3.75%  
Investment, interest rate       6.51% 6.51% 6.51%  
Investment, principal       $ 3,377      
Investment owned, at cost       3,365      
Investments at fair value       $ 3,213      
Investment, Identifier [Axis]: Swordfish Merger Sub LLC, Auto Parts & Equipment, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.75% 6.75% 6.75%  
Investment, interest rate [8],[9],[10],[11]       9.81% 9.81% 9.81%  
Investment, principal [8],[9],[10],[12]       $ 12,500      
Investment owned, at cost [8],[9],[10]       12,474      
Investments at fair value [8],[9],[10]       $ 11,469      
Investment, Identifier [Axis]: TGNR HoldCo LLC, Integrated Oil & Gas, Subordinated Debt              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate 11.50% [2],[4],[5],[6],[14] 11.50% [2],[4],[5],[6],[14] 11.50% [2],[4],[5],[6],[14] 11.50% [8],[9],[10],[11],[16] 11.50% [8],[9],[10],[11],[16] 11.50% [8],[9],[10],[11],[16]  
Investment, principal $ 4,984 [4],[6],[7],[14]     $ 4,984 [8],[9],[12],[16]      
Investment owned, at cost 4,894 [4],[6],[14]     4,866 [8],[9],[16]      
Investments at fair value $ 4,785 [4],[6],[14]     $ 4,872 [8],[9],[16]      
Investment, Identifier [Axis]: THL Zinc Ventures Ltd, Diversified Metals & Mining, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [1],[2],[4],[5],[14] 13.00% 13.00% 13.00%        
Investment, principal [1],[4],[7],[14] $ 50,419            
Investment owned, at cost [1],[4],[14] 49,842            
Investments at fair value [1],[4],[14] $ 49,869            
Investment, Identifier [Axis]: TIBCO Software Inc., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [9],[10]       4.50% 4.50% 4.50%  
Investment, interest rate [9],[10],[11]       8.15% 8.15% 8.15%  
Investment, principal [9],[10],[12]       $ 12,032      
Investment owned, at cost [9],[10]       10,949      
Investments at fair value [9],[10]       $ 10,827      
Investment, Identifier [Axis]: TIBCO Software Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%  
Investment, interest rate 9.99% 9.99% 9.99% 8.15% 8.15% 8.15%  
Investment, principal $ 8,215     $ 6,256      
Investment owned, at cost 7,559     5,693      
Investments at fair value $ 7,913     $ 5,629      
Investment, Identifier [Axis]: TIBCO Software Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%  
Investment, interest rate 9.99% 9.99% 9.99% 8.15% 8.15% 8.15%  
Investment, principal $ 2,641     $ 2,654      
Investment owned, at cost 2,439     2,415      
Investments at fair value $ 2,544     $ 2,388      
Investment, Identifier [Axis]: Tacala, LLC, Restaurants, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 8.00% [4],[5] 8.00% [4],[5] 8.00% [4],[5] 7.50% [9],[10] 7.50% [9],[10] 7.50% [9],[10]  
Investment, interest rate 13.43% [2],[4],[5] 13.43% [2],[4],[5] 13.43% [2],[4],[5] 10.62% [9],[10],[11] 10.62% [9],[10],[11] 10.62% [9],[10],[11]  
Investment, principal $ 12,843 [4],[5],[7]     $ 9,448 [9],[10],[12]      
Investment owned, at cost 12,603 [4],[5]     9,338 [9],[10]      
Investments at fair value $ 12,464 [4],[5]     $ 8,692 [9],[10]      
Investment, Identifier [Axis]: Tahoe Bidco B.V., Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[3],[4],[5],[14] 6.00% [1],[3],[4],[5],[14] 6.00% [1],[3],[4],[5],[14] 6.00% [8],[9],[10],[13],[16] 6.00% [8],[9],[10],[13],[16] 6.00% [8],[9],[10],[13],[16]  
Investment, principal $ 0 [1],[3],[4],[5],[7],[14]     $ 0 [8],[9],[10],[12],[13],[16]      
Investment owned, at cost (29) [1],[3],[4],[5],[14]     (29) [8],[9],[10],[13],[16]      
Investments at fair value $ (22) [1],[3],[4],[5],[14]     $ (28) [8],[9],[10],[13],[16]      
Investment, Identifier [Axis]: Tahoe Bidco B.V., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[4],[5],[14] 6.00% [1],[4],[5],[14] 6.00% [1],[4],[5],[14] 6.00% [8],[9],[10],[16] 6.00% [8],[9],[10],[16] 6.00% [8],[9],[10],[16]  
Investment, interest rate 11.42% [1],[2],[4],[5],[14] 11.42% [1],[2],[4],[5],[14] 11.42% [1],[2],[4],[5],[14] 8.68% [8],[9],[10],[11],[16] 8.68% [8],[9],[10],[11],[16] 8.68% [8],[9],[10],[11],[16]  
Investment, principal $ 28,826 [1],[4],[5],[7],[14]     $ 23,215 [8],[9],[10],[12],[16]      
Investment owned, at cost 28,595 [1],[4],[5],[14]     22,815 [8],[9],[10],[16]      
Investments at fair value $ 28,537 [1],[4],[5],[14]     $ 22,843 [8],[9],[10],[16]      
Investment, Identifier [Axis]: Tecta America Corp., Construction & Engineering, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.50% 8.50% 8.50%  
Investment, interest rate [8],[9],[10],[11]       11.62% 11.62% 11.62%  
Investment, principal [8],[9],[10],[12]       $ 5,203      
Investment owned, at cost [8],[9],[10]       5,125      
Investments at fair value [8],[9],[10]       $ 5,034      
Investment, Identifier [Axis]: Telestream Holdings Corporation, Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 9.75% [1],[3],[4],[5] 9.75% [1],[3],[4],[5] 9.75% [1],[3],[4],[5] 9.25% [8],[9],[10],[13] 9.25% [8],[9],[10],[13] 9.25% [8],[9],[10],[13]  
Investment, interest rate 15.17% [1],[2],[3],[4],[5] 15.17% [1],[2],[3],[4],[5] 15.17% [1],[2],[3],[4],[5] 12.20% [8],[9],[10],[11],[13] 12.20% [8],[9],[10],[11],[13] 12.20% [8],[9],[10],[11],[13]  
Investment, principal $ 1,861 [1],[3],[4],[5],[7]     $ 1,231 [8],[9],[10],[12],[13]      
Investment owned, at cost 1,845 [1],[3],[4],[5]     1,210 [8],[9],[10],[13]      
Investments at fair value $ 1,802 [1],[3],[4],[5]     $ 1,187 [8],[9],[10],[13]      
Investment, Identifier [Axis]: Telestream Holdings Corporation, Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 9.75% [1],[4],[5] 9.75% [1],[4],[5] 9.75% [1],[4],[5] 9.25% [8],[9],[10] 9.25% [8],[9],[10] 9.25% [8],[9],[10]  
Investment, interest rate 15.26% [1],[2],[4],[5] 15.26% [1],[2],[4],[5] 15.26% [1],[2],[4],[5] 12.11% [8],[9],[10],[11] 12.11% [8],[9],[10],[11] 12.11% [8],[9],[10],[11]  
Investment, principal $ 23,423 [1],[4],[5],[7]     $ 18,323 [8],[9],[10],[12]      
Investment owned, at cost 23,207 [1],[4],[5]     17,956 [8],[9],[10]      
Investments at fair value $ 22,814 [1],[4],[5]     $ 17,865 [8],[9],[10]      
Investment, Identifier [Axis]: Ten-X LLC, Interactive Media & Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 6.00% 6.00% 6.00%        
Investment, interest rate [1],[2],[4],[5] 11.32% 11.32% 11.32%        
Investment, principal [1],[4],[5],[7] $ 19,947            
Investment owned, at cost [1],[4],[5] 19,013            
Investments at fair value [1],[4],[5] $ 19,199            
Investment, Identifier [Axis]: TerSera Therapeutics LLC, Pharmaceuticals, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       668,879 668,879 668,879  
Investment, principal [8],[9],[12]            
Investment owned, at cost [8],[9]       2,028      
Investments at fair value [8],[9]       $ 4,077      
Investment, Identifier [Axis]: TerSera Therapeutics LLC, Pharmaceuticals, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       9.50% 9.50% 9.50%  
Investment, interest rate [8],[9],[10],[11]       13.17% 13.17% 13.17%  
Investment, principal [8],[9],[10],[12]       $ 29,663      
Investment owned, at cost [8],[9],[10]       29,352      
Investments at fair value [8],[9],[10]       $ 29,031      
Investment, Identifier [Axis]: The Avery, Real Estate Operating Companies, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.30% [1],[4],[5],[17] 7.30% [1],[4],[5],[17] 7.30% [1],[4],[5],[17] 7.30% [8],[9],[10] 7.30% [8],[9],[10] 7.30% [8],[9],[10]  
Investment, interest rate [8],[9],[10],[11]       10.44% 10.44% 10.44%  
Investment, principal $ 19,163 [1],[4],[5],[7],[17]     $ 15,674 [8],[9],[10],[12]      
Investment owned, at cost 19,163 [1],[4],[5],[17]     15,605 [8],[9],[10]      
Investments at fair value $ 18,340 [1],[4],[5],[17]     $ 15,682 [8],[9],[10]      
Investment, Identifier [Axis]: The Avery, Real Estate Operating Companies, Subordinated Debt Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 12.50% [1],[4],[5],[17] 12.50% [1],[4],[5],[17] 12.50% [1],[4],[5],[17] 12.50% [8],[9],[10] 12.50% [8],[9],[10] 12.50% [8],[9],[10]  
Investment, interest rate [8],[9],[10],[11]       16.17% 16.17% 16.17%  
Investment, principal $ 4,641 [1],[4],[5],[7],[17]     $ 3,789 [8],[9],[10],[12]      
Investment owned, at cost 4,641 [1],[4],[5],[17]     3,774 [8],[9],[10]      
Investments at fair value $ 4,170 [1],[4],[5],[17]     $ 3,800 [8],[9],[10]      
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.00% 7.00% 7.00%        
Investment, principal [1],[4],[5],[7] $ 46,832            
Investment owned, at cost [1],[4],[5] 45,698            
Investments at fair value [1],[4],[5] $ 37,231            
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, Preferred Equity 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 10,616 10,616 10,616        
Investment owned, at cost [1],[4] $ 120            
Investments at fair value [1],[4] $ 0            
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, Preferred Equity 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 358,299 358,299 358,299        
Investment owned, at cost [1],[4] $ 2,912            
Investments at fair value [1],[4] $ 0            
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, Preferred Equity 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 60,862 60,862 60,862        
Investment owned, at cost [1],[4] $ 1,207            
Investments at fair value [1],[4] $ 108            
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, Preferred Equity 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 32,447 32,447 32,447        
Investment owned, at cost [1],[4] $ 33,353            
Investments at fair value [1],[4] $ 31,701            
Investment, Identifier [Axis]: Thrasio, LLC, Internet & Direct Marketing Retail, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.00% 7.00% 7.00%  
Investment, interest rate [8],[9],[10],[11]       11.17% 11.17% 11.17%  
Investment, principal [8],[9],[10],[12]       $ 37,494      
Investment owned, at cost [8],[9],[10]       36,569      
Investments at fair value [8],[9],[10]       $ 35,807      
Investment, Identifier [Axis]: Thrasio, LLC, Internet & Direct Marketing Retail, Preferred Equity 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       8,434 8,434 8,434  
Investment owned, at cost [8],[9]       $ 101      
Investments at fair value [8],[9]       $ 69      
Investment, Identifier [Axis]: Thrasio, LLC, Internet & Direct Marketing Retail, Preferred Equity 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       284,650 284,650 284,650  
Investment owned, at cost [8],[9]       $ 2,409      
Investments at fair value [8],[9]       $ 2,320      
Investment, Identifier [Axis]: Thrasio, LLC, Internet & Direct Marketing Retail, Preferred Equity 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       48,352 48,352 48,352  
Investment owned, at cost [8],[9]       $ 979      
Investments at fair value [8],[9]       $ 979      
Investment, Identifier [Axis]: Thrasio, LLC, Internet & Direct Marketing Retail, Preferred Equity 4              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9],[13]       23,201 23,201 23,201  
Investment owned, at cost [8],[9],[13]       $ 22,986      
Investments at fair value [8],[9],[13]       $ 26,487      
Investment, Identifier [Axis]: Touchstone Acquisition, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Investment, interest rate 11.42% 11.42% 11.42% 9.12% 9.12% 9.12%  
Investment, principal $ 7,212     $ 7,285      
Investment owned, at cost 7,103     7,155      
Investments at fair value $ 7,022     $ 7,140      
Investment, Identifier [Axis]: Touchstone Acquisition, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Investment, interest rate 11.42% 11.42% 11.42% 9.12% 9.12% 9.12%  
Investment, principal $ 2,993     $ 3,024      
Investment owned, at cost 2,948     2,970      
Investments at fair value $ 2,914     $ 2,963      
Investment, Identifier [Axis]: Touchstone Acquisition, Inc., Health Care Supplies, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.00% [1],[4],[5] 6.00% [1],[4],[5] 6.00% [1],[4],[5] 6.00% [8],[9],[10] 6.00% [8],[9],[10] 6.00% [8],[9],[10]  
Investment, interest rate 11.42% [1],[2],[4],[5] 11.42% [1],[2],[4],[5] 11.42% [1],[2],[4],[5] 9.12% [8],[9],[10],[11] 9.12% [8],[9],[10],[11] 9.12% [8],[9],[10],[11]  
Investment, principal $ 11,671 [1],[4],[5],[7]     $ 6,016 [8],[9],[10],[12]      
Investment owned, at cost 11,646 [1],[4],[5]     5,908 [8],[9],[10]      
Investments at fair value $ 11,363 [1],[4],[5]     $ 5,895 [8],[9],[10]      
Investment, Identifier [Axis]: Tribe Buyer LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.50% 4.50% 4.50%  
Investment, interest rate       7.62% 7.62% 7.62%  
Investment, principal       $ 1,583      
Investment owned, at cost       1,582      
Investments at fair value       $ 1,266      
Investment, Identifier [Axis]: Trinitas CLO XV DAC, Multi-Sector Holdings, CLO Notes              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [4],[5],[14] 7.71% 7.71% 7.71%        
Investment, interest rate [2],[4],[5],[14] 13.06% 13.06% 13.06%        
Investment, principal [4],[5],[7],[14] $ 1,000            
Investment owned, at cost [4],[5],[14] 816            
Investments at fair value [4],[5],[14] $ 917            
Investment, Identifier [Axis]: Uniti Group LP, Other Specialized REITs, Fixed Rate Bond 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [2],[4],[5],[14] 6.50% 6.50% 6.50%        
Investment, principal [4],[7],[14] $ 4,500            
Investment owned, at cost [4],[14] 4,115            
Investments at fair value [4],[14] $ 2,953            
Investment, Identifier [Axis]: Uniti Group LP, Other Specialized REITs, Fixed Rate Bond 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [2],[4],[5],[14] 4.75% 4.75% 4.75%        
Investment, principal [4],[7],[14] $ 300            
Investment owned, at cost [4],[14] 264            
Investments at fair value [4],[14] $ 245            
Investment, Identifier [Axis]: Uniti Group LP, Specialized REITs, Fixed Rate Bond 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11],[16]       6.50% 6.50% 6.50%  
Investment, principal [9],[12],[16]       $ 4,500      
Investment owned, at cost [9],[16]       4,060      
Investments at fair value [9],[16]       $ 3,026      
Investment, Identifier [Axis]: Uniti Group LP, Specialized REITs, Fixed Rate Bond 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11],[16]       4.75% 4.75% 4.75%  
Investment, principal [9],[12],[16]       $ 300      
Investment owned, at cost [9],[16]       258      
Investments at fair value [9],[16]       $ 238      
Investment, Identifier [Axis]: Veritas US Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, interest rate 10.43% 10.43% 10.43% 8.67% 8.67% 8.67%  
Investment, principal $ 6,305     $ 6,365      
Investment owned, at cost 6,257     6,290      
Investments at fair value $ 5,500     $ 5,087      
Investment, Identifier [Axis]: Virgin Pulse, Inc., Application Software, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 7.25% 7.25% 7.25%        
Investment, interest rate [1],[2],[4],[5] 12.68% 12.68% 12.68%        
Investment, principal [1],[4],[5],[7] $ 1,140            
Investment owned, at cost [1],[4],[5] 927            
Investments at fair value [1],[4],[5] $ 1,139            
Investment, Identifier [Axis]: WP CPP Holdings, LLC, Aerospace & Defense, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.75% [4],[5] 3.75% [4],[5] 3.75% [4],[5] 3.75% [9],[10] 3.75% [9],[10] 3.75% [9],[10]  
Investment, interest rate 9.27% [2],[4],[5] 9.27% [2],[4],[5] 9.27% [2],[4],[5] 6.56% [9],[10],[11] 6.56% [9],[10],[11] 6.56% [9],[10],[11]  
Investment, principal $ 11,792 [4],[5],[7]     $ 7,564 [9],[10],[12]      
Investment owned, at cost 11,281 [4],[5]     6,989 [9],[10]      
Investments at fair value $ 11,127 [4],[5]     $ 6,795 [9],[10]      
Investment, Identifier [Axis]: WP CPP Holdings, LLC, Aerospace & Defense, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       7.75% 7.75% 7.75%  
Investment, interest rate [8],[9],[10],[11]       10.56% 10.56% 10.56%  
Investment, principal [8],[9],[10],[12]       $ 6,000      
Investment owned, at cost [8],[9],[10]       5,855      
Investments at fair value [8],[9],[10]       $ 5,070      
Investment, Identifier [Axis]: WP CPP Holdings, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Investment, interest rate 9.27% 9.27% 9.27% 6.56% 6.56% 6.56%  
Investment, principal $ 1,965     $ 1,985      
Investment owned, at cost 1,920     1,910      
Investments at fair value $ 1,855     $ 1,783      
Investment, Identifier [Axis]: WP CPP Holdings, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%  
Investment, interest rate 9.27% 9.27% 9.27% 6.56% 6.56% 6.56%  
Investment, principal $ 983     $ 993      
Investment owned, at cost 960     955      
Investments at fair value $ 927     $ 892      
Investment, Identifier [Axis]: WP CPP Holdings, LLC, Second Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       7.75% 7.75% 7.75%  
Investment, interest rate       10.56% 10.56% 10.56%  
Investment, principal       $ 6,000      
Investment owned, at cost       5,972      
Investments at fair value       $ 5,070      
Investment, Identifier [Axis]: WP CPP Holdings, LLC, Second Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       7.75% 7.75% 7.75%  
Investment, interest rate       10.56% 10.56% 10.56%  
Investment, principal       $ 3,000      
Investment owned, at cost       2,986      
Investments at fair value       $ 2,534      
Investment, Identifier [Axis]: WPEngine, Inc., Application Software, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       6.00% 6.00% 6.00%  
Investment, interest rate [8],[9],[10],[11]       10.19% 10.19% 10.19%  
Investment, principal [8],[9],[10],[12]       $ 40,536      
Investment owned, at cost [8],[9],[10]       39,947      
Investments at fair value [8],[9],[10]       $ 40,131      
Investment, Identifier [Axis]: WWEX Uni Topco Holdings, LLC, Air Freight & Logistics, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.00% [1],[4],[5] 7.00% [1],[4],[5] 7.00% [1],[4],[5] 7.00% [8],[9],[10] 7.00% [8],[9],[10] 7.00% [8],[9],[10]  
Investment, interest rate 12.65% [1],[2],[4],[5] 12.65% [1],[2],[4],[5] 12.65% [1],[2],[4],[5] 10.67% [8],[9],[10],[11] 10.67% [8],[9],[10],[11] 10.67% [8],[9],[10],[11]  
Investment, principal $ 5,000 [1],[4],[5],[7]     $ 5,000 [8],[9],[10],[12]      
Investment owned, at cost 4,925 [1],[4],[5]     4,925 [8],[9],[10]      
Investments at fair value $ 4,263 [1],[4],[5]     $ 4,538 [8],[9],[10]      
Investment, Identifier [Axis]: Win Brands Group LLC, Housewares & Specialties, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       15.00% 15.00% 15.00%  
Investment, interest rate [8],[9],[10],[11]       19.64% 19.64% 19.64%  
Investment, principal [8],[9],[10],[12]       $ 2,316      
Investment owned, at cost [8],[9],[10]       2,293      
Investments at fair value [8],[9],[10]       $ 2,264      
Investment, Identifier [Axis]: Win Brands Group LLC, Housewares & Specialties, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 15.00% 15.00% 15.00%        
Investment, interest rate [1],[2],[4],[5] 21.68% 21.68% 21.68%        
Investment, principal [1],[4],[5],[7] $ 1,565            
Investment owned, at cost [1],[4],[5] 1,551            
Investments at fair value [1],[4],[5] $ 1,464            
Investment, Identifier [Axis]: Win Brands Group LLC, Housewares & Specialties, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 15.00% 15.00% 15.00%        
Investment, interest rate [1],[2],[4],[5] 21.68% 21.68% 21.68%        
Investment, principal [1],[4],[5],[7] $ 1,323            
Investment owned, at cost [1],[4],[5] 1,311            
Investments at fair value [1],[4],[5] $ 1,237            
Investment, Identifier [Axis]: Win Brands Group LLC, Housewares & Specialties, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 4,871 [1],[4] 4,871 [1],[4] 4,871 [1],[4] 3,621 [8],[9] 3,621 [8],[9] 3,621 [8],[9]  
Investment owned, at cost $ 46 [1],[4]     $ 0 [8],[9]      
Investments at fair value $ 107 [1],[4]     $ 192 [8],[9]      
Investment, Identifier [Axis]: Windstream Services II, LLC, First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Investment, interest rate 11.67% 11.67% 11.67% 9.37% 9.37% 9.37%  
Investment, principal $ 6,148     $ 7,818      
Investment owned, at cost 6,008     7,596      
Investments at fair value $ 5,939     $ 7,115      
Investment, Identifier [Axis]: Windstream Services II, LLC, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Investment, interest rate 11.67% 11.67% 11.67% 9.37% 9.37% 9.37%  
Investment, principal $ 3,843     $ 4,886      
Investment owned, at cost 3,756     4,747      
Investments at fair value $ 3,712     $ 4,447      
Investment, Identifier [Axis]: Windstream Services II, LLC, Integrated Telecommunication Services, Common Stock              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 127,452 [1],[4] 127,452 [1],[4] 127,452 [1],[4] 18,032 [8],[9] 18,032 [8],[9] 18,032 [8],[9]  
Investment owned, at cost $ 2,057 [1],[4]     $ 216 [8],[9]      
Investments at fair value $ 1,319 [1],[4]     $ 296 [8],[9]      
Investment, Identifier [Axis]: Windstream Services II, LLC, Integrated Telecommunication Services, First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.25% [4],[5] 6.25% [4],[5] 6.25% [4],[5] 6.25% [9],[10] 6.25% [9],[10] 6.25% [9],[10]  
Investment, interest rate 11.67% [2],[4],[5] 11.67% [2],[4],[5] 11.67% [2],[4],[5] 9.37% [9],[10],[11] 9.37% [9],[10],[11] 9.37% [9],[10],[11]  
Investment, principal $ 8,983 [4],[5],[7]     $ 25,499 [9],[10],[12]      
Investment owned, at cost 8,698 [4],[5]     24,632 [9],[10]      
Investments at fair value $ 8,678 [4],[5]     $ 23,204 [9],[10]      
Investment, Identifier [Axis]: Windstream Services II, LLC, Integrated Telecommunication Services, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [8],[9]       109,420 109,420 109,420  
Investment owned, at cost [8],[9]       $ 1,842      
Investments at fair value [8],[9]       $ 1,799      
Investment, Identifier [Axis]: Zayo Group Holdings, Inc., Alternative Carriers, Fixed Rate Bond              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, interest rate [9],[10],[11]       4.00% 4.00% 4.00%  
Investment, principal [9],[12]       $ 250      
Investment owned, at cost [9]       212      
Investments at fair value [9]       $ 201      
Investment, Identifier [Axis]: Zayo Group Holdings, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       3.00% 3.00% 3.00%  
Investment, interest rate       6.12% 6.12% 6.12%  
Investment, principal       $ 2,155      
Investment owned, at cost       2,000      
Investments at fair value       $ 1,812      
Investment, Identifier [Axis]: Zep Inc., Specialty Chemicals, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10]       8.25% 8.25% 8.25%  
Investment, interest rate [8],[9],[10],[11]       11.92% 11.92% 11.92%  
Investment, principal [8],[9],[10],[12]       $ 19,578      
Investment owned, at cost [8],[9],[10]       19,542      
Investments at fair value [8],[9],[10]       $ 16,152      
Investment, Identifier [Axis]: Zep Inc., Specialty Chemicals,First Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 4.00% 4.00% 4.00%        
Investment, interest rate [1],[2],[4],[5] 9.32% 9.32% 9.32%        
Investment, principal [1],[4],[5],[7] $ 19,578            
Investment owned, at cost [1],[4],[5] 19,568            
Investments at fair value [1],[4],[5] $ 19,489            
Investment, Identifier [Axis]: Zephyr Bidco Limited, Specialized Finance, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [8],[9],[10],[16]       7.50% 7.50% 7.50%  
Investment, interest rate [8],[9],[10],[11],[16]       9.72% 9.72% 9.72%  
Investment, principal | £ [8],[9],[10],[12],[16]           £ 18,000  
Investment owned, at cost [8],[9],[10],[16]       $ 23,804      
Investments at fair value [8],[9],[10],[16]       $ 16,552      
Investment, Identifier [Axis]: Zephyr Bidco Limited,Specialized Finance, Second Lien Term Loan              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5],[14] 7.50% 7.50% 7.50%        
Investment, interest rate [1],[2],[4],[5],[14] 12.72% 12.72% 12.72%        
Investment, principal | £ [1],[4],[5],[7],[14]     £ 20,000        
Investment owned, at cost [1],[4],[5],[14] $ 25,841            
Investments at fair value [1],[4],[5],[14] $ 22,914            
Investment, Identifier [Axis]: athenahealth Group Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.25% 3.25% 3.25%        
Investment, interest rate 8.57% 8.57% 8.57%        
Investment, principal $ 4,320            
Investment owned, at cost 4,080            
Investments at fair value $ 4,251            
Investment, Identifier [Axis]: athenahealth Group Inc., Health Care Technology, First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 3.25% 3.25% 3.25%        
Investment, interest rate 8.57% 8.57% 8.57%        
Investment, principal $ 1,772            
Investment owned, at cost 1,674            
Investments at fair value $ 1,744            
Investment, Identifier [Axis]: athenahealth Group Inc., Health Care Technology, Preferred Equity              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares 21,523 [1],[4] 21,523 [1],[4] 21,523 [1],[4] 18,635 [8],[9] 18,635 [8],[9] 18,635 [8],[9]  
Investment owned, at cost $ 20,789 [1],[4]     $ 18,264 [8],[9]      
Investments at fair value $ 20,074 [1],[4]     $ 16,575 [8],[9]      
Investment, Identifier [Axis]: eResearch Technology, Inc., First Lien Term Loan | SLF JV I              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.50% 4.50% 4.50%  
Investment, interest rate       7.62% 7.62% 7.62%  
Investment, principal       $ 7,331      
Investment owned, at cost       7,258      
Investments at fair value       $ 6,859      
Investment, Identifier [Axis]: eResearch Technology, Inc., First Lien Term Loan | OCSI Glick JV LLC              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate       4.50% 4.50% 4.50%  
Investment, interest rate       7.62% 7.62% 7.62%  
Investment, principal       $ 2,444      
Investment owned, at cost       2,419      
Investments at fair value       $ 2,286      
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Revolver              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 6.75% [1],[3],[4],[5] 6.75% [1],[3],[4],[5] 6.75% [1],[3],[4],[5] 6.75% [8],[9],[10],[13] 6.75% [8],[9],[10],[13] 6.75% [8],[9],[10],[13]  
Investment, interest rate [1],[2],[3],[4],[5] 12.14% 12.14% 12.14%        
Investment, principal $ 377 [1],[3],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost 334 [1],[3],[4],[5]     (31) [8],[9],[10],[13]      
Investments at fair value $ 296 [1],[3],[4],[5]     $ (32) [8],[9],[10],[13]      
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.25% [1],[4],[5] 7.25% [1],[4],[5] 7.25% [1],[4],[5] 6.75% [8],[9],[10] 6.75% [8],[9],[10] 6.75% [8],[9],[10]  
Investment, interest rate 12.63% [1],[2],[4],[5] 12.63% [1],[2],[4],[5] 12.63% [1],[2],[4],[5] 9.49% [8],[9],[10],[11] 9.49% [8],[9],[10],[11] 9.49% [8],[9],[10],[11]  
Investment, principal $ 24,427 [1],[4],[5],[7]     $ 19,203 [8],[9],[10],[12]      
Investment owned, at cost 24,135 [1],[4],[5]     18,874 [8],[9],[10]      
Investments at fair value $ 23,548 [1],[4],[5]     $ 18,867 [8],[9],[10]      
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate 7.25% [1],[4],[5] 7.25% [1],[4],[5] 7.25% [1],[4],[5] 6.75% [8],[9],[10],[13] 6.75% [8],[9],[10],[13] 6.75% [8],[9],[10],[13]  
Investment, interest rate [1],[2],[4],[5] 12.63% 12.63% 12.63%        
Investment, principal $ 3,636 [1],[4],[5],[7]     $ 0 [8],[9],[10],[12],[13]      
Investment owned, at cost 3,602 [1],[4],[5]     0 [8],[9],[10],[13]      
Investments at fair value $ 3,574 [1],[4],[5]     $ 0 [8],[9],[10],[13]      
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 7.25% 7.25% 7.25%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] 0            
Investments at fair value [1],[3],[4],[5] $ 0            
Investment, Identifier [Axis]: scPharmaceuticals Inc., Pharmaceuticals, First Lien Term Loan 1              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[4],[5] 8.75% 8.75% 8.75%        
Investment, interest rate [1],[2],[4],[5] 11.75% 11.75% 11.75%        
Investment, principal [1],[4],[5],[7] $ 5,212            
Investment owned, at cost [1],[4],[5] 4,987            
Investments at fair value [1],[4],[5] $ 4,990            
Investment, Identifier [Axis]: scPharmaceuticals Inc., Pharmaceuticals, First Lien Term Loan 2              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 8.75% 8.75% 8.75%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] 0            
Investments at fair value [1],[3],[4],[5] $ 0            
Investment, Identifier [Axis]: scPharmaceuticals Inc., Pharmaceuticals, First Lien Term Loan 3              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment, basis spread, variable rate [1],[3],[4],[5] 8.75% 8.75% 8.75%        
Investment, principal [1],[3],[4],[5],[7] $ 0            
Investment owned, at cost [1],[3],[4],[5] 0            
Investments at fair value [1],[3],[4],[5] $ 0            
Investment, Identifier [Axis]: scPharmaceuticals Inc., Pharmaceuticals, Warrants              
Investment Company, Nonconsolidated Subsidiary [Line Items]              
Investment owned, balance (in shares) | shares [1],[4] 53,700 53,700 53,700        
Investment owned, at cost [1],[4] $ 175            
Investments at fair value [1],[4] $ 258            
[1] As of September 30, 2023, these investments were categorized as Level 3 within the fair value hierarchy established by Financial Accounting Standards Board ("FASB") guidance under Accounting Standards Codification ("ASC") Topic 820, Fair Value Measurements and Disclosures ("ASC 820").
[2] Interest rates may be adjusted from period to period on certain term loans and revolvers. These rate adjustments may be either temporary in nature due to tier pricing arrangements or financial or payment covenant violations in the original credit agreements or permanent in nature per loan amendment or waiver documents.
[3] Investment had undrawn commitments. Unamortized fees are classified as unearned income which reduces cost basis, which may result in a negative cost basis. A negative fair value may result from the unfunded commitment being valued below par.
[4] Non-Control/Non-Affiliate Investments are investments that are neither Control Investments nor Affiliate Investments.
[5] The interest rate on the principal balance outstanding for most of the floating rate loans is indexed to the secured overnight financing rate ("SOFR"), the London Interbank Offered Rate ("LIBOR" or "L"), the sterling overnight index average ("SONIA") and/or an alternate base rate (e.g., prime rate), which typically resets semi-annually, quarterly, or monthly at the borrower's option. The borrower may also elect to have multiple interest reset periods for each loan. For each of these loans, the Company has provided the applicable margin over the reference rate based on each respective credit agreement and the cash interest rate as of period end. All LIBOR and SOFR shown above is in U.S. dollars unless otherwise noted. As of September 30, 2023, the reference rates for the Company's variable rate loans were the 30-day SOFR at 5.32%, the 90-day SOFR at 5.39%, the 180-day SOFR at 5.47%, the 30-day LIBOR at 5.43%, the 90-day LIBOR at 5.65%, the 180-day LIBOR at 5.90%, the PRIME at 8.50%, the SONIA at 5.19%, the 30-day EURIBOR at 3.42%, the 90-day EURIBOR at 3.82% and the 180-day EURIBOR at 3.95%. Most loans include an interest floor, which generally ranges from 0% to 2.75%. SOFR and SONIA based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread.
[6] This investment represents a participation interest in the underlying securities shown.
[7] Principal includes accumulated payment in kind ("PIK") interest and is net of repayments, if any. “£” signifies the investment is denominated in British Pounds. "€" signifies the investment is denominated in Euros. All other investments are denominated in U.S. dollars.
[8] As of September 30, 2022, these investments were categorized as Level 3 within the fair value hierarchy established by FASB guidance under ASC 820.
[9] Non-Control/Non-Affiliate Investments are investments that are neither Control Investments nor Affiliate Investments.
[10] The interest rate on the principal balance outstanding for most of the floating rate loans is indexed to LIBOR, SOFR, SONIA and/or an alternate base rate (e.g., prime rate), which typically resets semi-annually, quarterly, or monthly at the borrower's option. The borrower may also elect to have multiple interest reset periods for each loan. For each of these loans, the Company has provided the applicable margin over the reference rate based on each respective credit agreement and the cash interest rate as of period end. All LIBOR shown above is in U.S. dollars unless otherwise noted. As of September 30, 2022, the reference rates for the Company's variable rate loans were the 30-day LIBOR at 3.12%, the 90-day LIBOR at 3.67%, the 180-day LIBOR at 4.17%, the 360-day LIBOR at 4.78%, the PRIME at 6.25%, the 30-day SOFR at 3.03%, the 90-day SOFR at 3.55%, the SONIA at 1.69%, the 30-day EURIBOR at 0.69%, the 90-day EURIBOR at 0.99% and the 180-day EURIBOR at 0.38%. Most loans include an interest floor, which generally ranges from 0% to 1%. SOFR and SONIA based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread.
[11] Interest rates may be adjusted from period to period on certain term loans and revolvers. These rate adjustments may be either temporary in nature due to tier pricing arrangements or financial or payment covenant violations in the original credit agreements or permanent in nature per loan amendment or waiver documents.
[12] Principal includes accumulated PIK interest and is net of repayments, if any. “£” signifies the investment is denominated in British Pounds. "€" signifies the investment is denominated in Euros. All other investments are denominated in U.S. dollars.
[13] Investment had undrawn commitments. Unamortized fees are classified as unearned income which reduces cost basis, which may result in a negative cost basis. A negative fair value may result from the unfunded commitment being valued below par.
[14] Investment is not a "qualifying asset" as defined under Section 55(a) of the Investment Company Act. Under the Investment Company Act, the Company may not acquire any non-qualifying asset unless, at the time the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. As of September 30, 2023, qualifying assets represented 73.6% of the Company's total assets and non-qualifying assets represented 26.4% of the Company's total assets.
[15] This investment represents a revenue interest financing term loan in which the Company receives periodic interest payments based on a percentage of revenues earned at the respective portfolio company over the life of the loan.
[16] Investment is not a "qualifying asset" as defined under Section 55(a) of the Investment Company Act. Under the Investment Company Act, the Company may not acquire any non-qualifying asset unless, at the time the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. As of September 30, 2022, qualifying assets represented 75.7% of the Company's total assets and non-qualifying assets represented 24.3% of the Company's total assets.
[17] This investment was on non-accrual status as of September 30, 2023.
[18] This investment represents Seller Earn Out Shares in Alvotech SA. One half of the Seller Earn Out Shares will vest if, at any time through June 16, 2027, the Alvotech SA common share price is at or above a volume weighted average price ("VWAP") of $15.00 per share for any ten trading days within any twenty trading day period, and the other half will vest, if at any time during such period, the common share price is at or above a VWAP of $20.00 per share for any ten trading days within any twenty trading day period.
[19] This investment represents Seller Earn Out Shares in Alvotech SA. One half of the Seller Earn Out Shares will vest if, at any time through June 16, 2027, the Alvotech SA common share price is at or above a VWAP of $15.00 per share for any ten trading days within any twenty trading day period, and the other half will vest, if at any time during such period, the common share price is at or above a VWAP of $20.00 per share for any ten trading days within any twenty trading day period.
[20] Affiliate Investments generally are defined by the Investment Company Act as investments in companies in which the Company owns between 5% and 25% of the voting securities.
[21] Affiliate Investments generally are defined by the Investment Company Act as investments in companies in which the Company owns between 5% and 25% of the voting securities.
[22] This investment represents a revenue interest financing term loan in which the Company receives periodic interest payments based on a percentage of revenues earned at the respective portfolio company over the life of the loan.
[23] As defined in the Investment Company Act, the Company is deemed to be both an "Affiliated Person" of and to "Control" these portfolio companies as the Company owns more than 25% of the portfolio company's outstanding voting securities or has the power to exercise control over management or policies of such portfolio company (including through a management agreement). See Schedule 12-14 in the accompanying notes to the Consolidated Financial Statements for transactions during the year ended September 30, 2022 in which the issuer was both an Affiliated Person and a portfolio company that the Company is deemed to control.
[24] Control Investments generally are defined by the Investment Company Act as investments in companies in which the Company owns more than 25% of the voting securities or maintains greater than 50% of the board representation.
[25] This investment was renamed during the three months ended March 31, 2022. For periods prior to March 31, 2022, this investment was referenced as Realfi Strategic Capital Funding LLC.
[26] See Note 3 in the accompanying notes to the Consolidated Financial Statements for portfolio composition.
[27] This investment was valued using net asset value as a practical expedient for fair value. Consistent with ASC 820, these investments are excluded from the hierarchical levels.
[28] See Note 3 in the accompanying notes to the Consolidated Financial Statements for portfolio composition.
[29] This investment was valued using net asset value as a practical expedient for fair value. Consistent with ASC 820, these investments are excluded from the hierarchical levels.
[30] Income producing through payment of dividends or distributions.
[31] Income producing through payment of dividends or distributions.
[32] This investment was renamed during the three months ended March 31, 2023. For periods prior to March 31, 2023, this investment was referenced as PFNY Holdings, LLC.