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Fair Value of Financial Instruments - Summary of Investments, Cash and Cash Equivalents, Credit Facility, or Prior Credit Facility, Notes and Asset Backed Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments $ 1,105,265 $ 1,164,254
Cash and cash equivalents 43,994 47,880
Total investments and cash and cash equivalents 1,149,259 1,212,134
Credit Facility payable 63,917 167,563
Total debt 552,638 672,779
2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 79,260 96,812
2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 182,860 [1] 182,276 [2]
2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 226,601 [1] 226,128 [2]
First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 950,244 1,009,642
Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 149 147
Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 154,872 154,465
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 43,994 47,880
Total investments and cash and cash equivalents 43,994 47,880
Credit Facility payable 0  
Total debt 79,260 96,812
Level 1 | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 79,260 96,812
Level 1 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0  
Level 1 | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0  
Level 1 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0  
Level 1 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0  
Level 1 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0  
Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0  
Total investments and cash and cash equivalents 0  
Credit Facility payable 0  
Total debt 182,860 182,276
Level 2 | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0  
Level 2 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 182,860 [1] 182,276 [2]
Level 2 | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0  
Level 2 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0  
Level 2 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0  
Level 2 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0  
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 1,048,422 1,104,927
Cash and cash equivalents 0  
Total investments and cash and cash equivalents 1,048,422 1,104,927
Credit Facility payable 63,917 167,563
Total debt 290,518 393,691
Level 3 | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0  
Level 3 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0  
Level 3 | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 226,601 [1] 226,128 [2]
Level 3 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 950,244 1,009,642
Level 3 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 149 147
Level 3 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 98,029 95,138
Measured at Net Asset Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 56,843 [3] 59,327 [4]
Cash and cash equivalents [3] 0  
Total investments and cash and cash equivalents 56,843 [3] 59,327 [4]
Credit Facility payable [3] 0  
Total debt [3] 0  
Measured at Net Asset Value | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [3] 0  
Measured at Net Asset Value | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1],[3] 0  
Measured at Net Asset Value | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1],[3] 0  
Measured at Net Asset Value | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments [3] 0  
Measured at Net Asset Value | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments [3] 0  
Measured at Net Asset Value | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments $ 56,843 [3] $ 59,327 [4]
[1] We elected not to apply the fair value option allowed by ASC 825-10 to the 2026 Notes and the 2031 Asset-Backed Debt and thus the balance reported in the Consolidated Statement of Assets and Liabilities represents the carrying value, which approximates the fair value.
[2] We elected not to apply the fair value option allowed by ASC 825-10 to the 2026 Notes and the 2031 Asset-Backed Debt and thus the balance reported in the Consolidated Statement of Assets and Liabilities represents the carrying value, which approximates the fair value.
[3] In accordance with ASC Subtopic 820-10, Fair Value Measurements and Disclosures, or ASC 820-10, our equity investment in PSSL and PTSF are measured using the net asset value per share (or its equivalent) as a practical expedient for fair value, and thus have not been classified in the fair value hierarchy.
[4] In accordance with ASC Subtopic 820-10, Fair Value Measurements and Disclosures, or ASC 820-10, our equity investment in PSSL and PTSF is measured using the net asset value per share (or its equivalent) as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy.