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Investments - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2025
USD ($)
Nov. 30, 2025
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Apr. 30, 2025
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Dec. 31, 2024
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Apr. 30, 2023
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Dec. 31, 2025
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Portfolio
Dec. 31, 2024
USD ($)
Sep. 30, 2025
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Portfolio
Oct. 29, 2025
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May 31, 2024
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Jan. 31, 2021
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Schedule Of Investments [Line Items]                      
Purchases of investments, including PIK interest           $ 302,700,000 $ 608,300,000        
Sales and repayments of investments           441,400,000 401,300,000        
Total assets           $ 2,716,082,000   $ 2,913,681,000      
Fair market capital contributions               39,400,000      
Number of members appointed           four          
Quorum description           Quorum is defined as (i) the presence of two members of the board of directors or investment committee, provided that at least one individual is present that was elected, designated or appointed by each member; (ii) the presence of three members of the board of directors or investment committee, provided that the individual that was elected, designated or appointed by the member with only one individual present shall be entitled to cast two votes on each matter; and (iii) the presence of four members of the board of directors or investment committee constitutes a quorum, provided that two individuals are present that were elected, designated or appointed by each member          
Credit Facility payable, at fair value (cost - $488,855 and $683,855, respectively)           $ 488,859,000   683,837,000      
Credit facility interest rate description       SOFR plus 225 basis points              
Debt securitization         $ 297,800,000       $ 21,000,000 $ 300,700,000 $ 300,700,000
Pennant Park C L O I I Ltd                      
Schedule Of Investments [Line Items]                      
Asset backed debt, transfer of assets, description           2032. On the closing date of the transaction, in consideration of PSSL’s transfer to PennantPark CLO II, Ltd. of the initial closing date loan portfolio, which included loans distributed to PSSL by certain of its wholly owned subsidiaries and us, PennantPark CLO II, Ltd. transferred to PSSL 100% of the Preferred Shares of PennantPark CLO II, Ltd. and 100% of the Class E Notes issued by PennantPark CLO II, Ltd.          
PennantPark CLO VI, LLC                      
Schedule Of Investments [Line Items]                      
Asset backed debt, transfer of assets, description         2035. On the closing date of the transaction, in consideration of PSSL’s transfer to PennantPark CLO VI, LLC of the initial closing date loan portfolio, which included loans distributed to PSSL by certain of its wholly owned subsidiaries and us, PennantPark CLO VI, LLC transferred to PSSL 100% of the Preferred Shares of CLO VI, LLC, all of which were held by PSSL.            
Debt instrument $ 315,800,000                    
PennantPark CLO VI, LLC | Class Loans A-R                      
Schedule Of Investments [Line Items]                      
Debt instrument $ 228,000,000                    
Interest rate 1.85%                    
PennantPark CLO VI, LLC | Class Loans B-R                      
Schedule Of Investments [Line Items]                      
Debt instrument $ 18,000,000                    
PennantPark CLO VI, LLC | Class Loans C-R                      
Schedule Of Investments [Line Items]                      
Debt instrument $ 18,000,000                    
Interest rate 4.50%                    
PennantPark CLO VI, LLC | Sub Notes                      
Schedule Of Investments [Line Items]                      
Debt instrument $ 51,800,000                    
PennantPark CLO 12, LLC                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 301,000,000                
Issuance date     2029-04                
Maturity date     2037-04                
Secured credit facility     $ 325,000,000                
PennantPark CLO 12, LLC | Class A-1 Loans                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 30,000,000                
Interest rate     1.45%                
PennantPark CLO 12, LLC | Class A-1 Notes                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 141,000,000                
Interest rate     1.45%                
PennantPark CLO 12, LLC | Class A-2 Notes                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 12,000,000                
Interest rate     1.60%                
PennantPark CLO 12, LLC | Class B Notes                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 21,000,000                
Interest rate     1.85%                
PennantPark CLO 12, LLC | Class C Notes                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 24,000,000                
Interest rate     2.30%                
PennantPark CLO 12, LLC | Class D Notes                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 18,000,000                
Interest rate     3.30%                
PennantPark CLO 12, LLC | Sub Notes                      
Schedule Of Investments [Line Items]                      
Debt instrument     $ 55,000,000                
Senior Secured Revolving Credit Facility                      
Schedule Of Investments [Line Items]                      
Credit Facility payable, at fair value (cost - $488,855 and $683,855, respectively)       $ 260,000,000     260,000,000        
PennantPark Senior Secured Loan Fund I LLC                      
Schedule Of Investments [Line Items]                      
Total assets           $ 1,235,184,000   $ 1,153,689,000      
Number of portfolio companies consisted of debt investments | Portfolio           120   117      
Percentage of capital ownership in each of outstanding subordinated notes and equity interests           87.50%   12.50%      
Credit Facility payable, at fair value (cost - $488,855 and $683,855, respectively)           $ 130,500,000   $ 74,500,000      
PennantPark Senior Secured Loan Fund I LLC | Senior Secured Revolving Credit Facility                      
Schedule Of Investments [Line Items]                      
Credit Facility payable, at fair value (cost - $488,855 and $683,855, respectively)       $ 325,000,000     $ 325,000,000        
PennantPark Senior Secured Loan Fund I LLC | Investment In Single Portfolio Company                      
Schedule Of Investments [Line Items]                      
Fair value of largest investment in a single portfolio company           25,000,000   20,900,000      
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments                      
Schedule Of Investments [Line Items]                      
Fair value of investment in five largest portfolio company           110,000,000   99,300,000      
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt                      
Schedule Of Investments [Line Items]                      
Total investments           237,700,000   237,700,000      
Additional unfunded investment           0   0      
PennantPark Senior Secured Loan Fund I LLC | Equity Interests                      
Schedule Of Investments [Line Items]                      
Total investments           163,100,000   123,700,000      
Additional unfunded investment in equity           (26,300,000)   $ 65,600,000      
Pennant Park Senior Secured Loan Fund II L L C [Member]                      
Schedule Of Investments [Line Items]                      
Total assets           201,676,000          
Total investments           200,000,000          
Fair market capital contributions           56,200          
Credit Facility payable, at fair value (cost - $488,855 and $683,855, respectively)           125,000,000          
Secured Debt           105,000,000          
Investment Membership Interest Amount           45,000,000          
Equity Securities At Fair Value           16,900,000          
Unfunded Debt Commitment           65,600,000          
Unfunded Equity Commitment           28,100,000          
Pennant Park Senior Secured Loan Fund II L L C [Member] | Revolving Credit Facility                      
Schedule Of Investments [Line Items]                      
Credit Facility payable, at fair value (cost - $488,855 and $683,855, respectively)   $ 150,000,000                  
Interest rate   1.85%                  
Pennant Park Senior Secured Loan Fund II L L C [Member] | Investment In Single Portfolio Company                      
Schedule Of Investments [Line Items]                      
Total investments           7,000,000          
Pennant Park Senior Secured Loan Fund II L L C [Member] | Five Largest Investments                      
Schedule Of Investments [Line Items]                      
Total investments           34,900,000          
Pennant Park Senior Secured Loan Fund II L L C [Member] | First Lien Secured Debt                      
Schedule Of Investments [Line Items]                      
first lien secured debt           39,400,000          
PennantPark Floating Rate Capital Ltd [Member]                      
Schedule Of Investments [Line Items]                      
Total investments           150,000,000          
Hamilton Lane [Member]                      
Schedule Of Investments [Line Items]                      
Total investments           50,000,000          
Secured Debt           35,000,000          
Investment Membership Interest Amount           $ 15,000,000