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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
Sep. 30, 2025
Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments $ 2,773,328 $ 1,983,504
Cash and Cash Equivalents, Fair Value 122,688 112,050
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 2,896,016 2,095,554
Credit Facility payable 683,837  
Total debt 1,776,770 1,177,033
2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt   265,235
2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 184,609 [1] 183,832 [2]
2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 284,627  
2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 265,366  
2037 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 358,331  
2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2]   284,086
First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,513,631 1,746,697
Credit Facility payable   443,880
Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 18,981 2,692
Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 240,716 234,115
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Cash and Cash Equivalents, Fair Value 122,688 112,050
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 122,688 112,050
Total debt 0 0
Level 1 | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt   0
Level 1 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 0 0
Level 1 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0  
Level 1 | 2036-R Asset-Backed Debt    
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 [2]   0
Level 1 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Credit Facility payable   0
Level 1 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Level 1 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Cash and Cash Equivalents, Fair Value 0 0
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 0 0
Total debt 184,609 183,832
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 [2] 184,609 183,832
Level 2 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0  
Level 2 | 2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0  
Level 2 | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2]   0
Level 2 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Credit Facility payable   0
Level 2 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Level 2 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,729,010 1,917,839
Cash and Cash Equivalents, Fair Value 0 0
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 2,729,010 1,917,839
Credit Facility payable 683,837  
Total debt 1,592,161 [1] 993,201
Level 3 | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt   265,235
Level 3 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 0 [2]
Level 3 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 284,627  
Level 3 | 2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 265,366  
Level 3 | 2037 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 358,331  
Level 3 | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2]   284,086
Level 3 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,513,631 1,746,697
Credit Facility payable   443,880
Level 3 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 18,981 2,692
Level 3 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 196,398 168,450
Measured at Net Asset Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments [3] 44,318 65,665
Cash and Cash Equivalents, Fair Value 0 [4] 0 [2]
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total [3] 44,318 65,665
Credit Facility payable [3]   0
Total debt 0 [4] 0 [2]
Measured at Net Asset Value | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2]   0
Measured at Net Asset Value | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 0 [4] 0
Measured at Net Asset Value | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1],[4] 0  
Measured at Net Asset Value | 2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1],[4] 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 [2]   0
Measured at Net Asset Value | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 [4] 0 [2]
Measured at Net Asset Value | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 [4] 0 [2]
Measured at Net Asset Value | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments [3] $ 44,318 $ 65,665
[1] We elected not to apply the fair value option allowed by ASC 825-10 to the 2026 Notes, the 2036 Asset-Backed Debt, the 2036-R Asset-Backed Debt, and the 2037 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, the 2036 Asset-Backed Debt and the 2036-R Asset Backed Debt 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 is measured using the net asset value per share (or its equivalent) as a practical expedient for fair value in accordance with the specialized accounting guidance for investment companies, and thus has 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 is measured using the net asset value per share (or its equivalent) as a practical expedient for fair value in accordance with the specialized accounting guidance for investment companies, and thus have not been classified in the fair value hierarchy.