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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, 2024
Sep. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments $ 1,983,504 $ 1,067,174
Cash and cash equivalents 112,050 100,555
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 2,095,554 1,167,729
Credit Facility payable 443,880 9,400
Total debt 1,177,033 495,432
2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt   76,219
2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 183,832 183,054
2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 284,086  
2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 265,235  
2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1]   226,759
First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 1,746,697 906,166
Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,692 149
Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 234,115 160,859
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Cash and cash equivalents 112,050 100,555
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 112,050 100,555
Credit Facility payable 0 0
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 [1] 0 0
Level 1 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 0  
Level 1 | 2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 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 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 0 0
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 0 0
Credit Facility payable 0 0
Total debt 183,832 183,054
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 [1] 183,832 183,054
Level 2 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 0  
Level 2 | 2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 0  
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 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 1,917,839 1,006,948
Cash and cash equivalents 0 0
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total 1,917,839 1,006,948
Credit Facility payable 443,880 9,400
Total debt 993,201 312,378
Level 3 | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt   76,219
Level 3 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 0 0
Level 3 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 284,086  
Level 3 | 2036-R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1] 265,235  
Level 3 | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1]   226,759
Level 3 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 1,746,697 906,166
Level 3 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,692 149
Level 3 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 168,450 100,633
Measured at Net Asset Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments [3] 65,665 60,226
Cash and cash equivalents 0 [4] 0 [1]
Investments And Cash And Cash Equivalents Fair Value Disclosure, Total [3] 65,665 60,226
Credit Facility payable 0 [4] 0 [1]
Total debt 0 [4] 0 [1]
Measured at Net Asset Value | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [1]   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] 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 [2],[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 [2],[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 [1]   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 [1]
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 [1]
Measured at Net Asset Value | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments [3] $ 65,665 $ 60,226
[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, the 2036 Asset-Backed Debt, and the 2036-R 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 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 and PTSF are 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.