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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
Mar. 31, 2025
Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments $ 2,344,052 $ 1,983,504
Cash and cash equivalents 111,358 112,050
Total investments and cash and cash equivalents 2,455,410 2,095,554
Long Term Credit Facility payable 273,790 443,880
Total debt 1,365,750 1,177,033
2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 184,220 [1] 183,832 [2]
2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 284,357 [1] 284,086 [2]
2036 R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 265,300 [1] 265,235 [2]
2037 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 358,083  
First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,100,173 1,746,697
Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments   2,692
Subordinate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 4,384  
Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 239,495 234,115
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 0 0
Cash and cash equivalents 111,358 112,050
Total investments and cash and cash equivalents 111,358 112,050
Long Term Credit Facility payable 0
Total debt 0 0
Level 1 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 [1] 0 [2]
Level 1 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 [1] 0 [2]
Level 1 | 2036 R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 [1] 0 [2]
Level 1 | 2037 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
Level 1 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments   0
Level 1 | Subordinate debt    
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 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
Total investments and cash and cash equivalents 0 0
Long Term Credit Facility payable 0
Total debt 184,220 183,832
Level 2 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 184,220 [1] 183,832 [2]
Level 2 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 [1] 0 [2]
Level 2 | 2036 R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 [1] 0 [2]
Level 2 | 2037 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
Level 2 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments   0
Level 2 | Subordinate debt    
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 0
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,275,788 1,917,839
Cash and cash equivalents 0 0
Total investments and cash and cash equivalents 2,275,788 1,917,839
Long Term Credit Facility payable 273,790 443,880
Total debt 1,181,530 993,201
Level 3 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 0 0
Level 3 | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 284,357 284,086
Level 3 | 2036 R Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 265,300 265,235
Level 3 | 2037 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt [2] 358,083  
Level 3 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 2,100,173 1,746,697
Level 3 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments   2,692
Level 3 | Subordinate debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 4,384  
Level 3 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 171,231 168,450
Measured at Net Asset Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 68,264 [3] 65,665 [4]
Cash and cash equivalents 0 [3] 0 [4]
Total investments and cash and cash equivalents 68,264 [3] 65,665 [4]
Long Term Credit Facility payable 0 [3] 0 [4]
Total debt 0 [3] 0 [4]
Measured at Net Asset Value | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 [1],[3] 0 [2],[4]
Measured at Net Asset Value | 2036 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 0 [1],[3] 0 [2],[4]
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 0 [1],[3] 0 [2],[4]
Measured at Net Asset Value | 2037 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 [3] 0 [4]
Measured at Net Asset Value | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments [4]   0
Measured at Net Asset Value | Subordinate debt    
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 $ 68,264 [3] $ 65,665 [4]
[1] We elected not to apply the fair value option allowed by ASC 825-10 to the 2026 Notes, 2031 Asset-Backed Debt, 2036 Asset-Backed Debt, 2036-R Asset-Backed Debt, and 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 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.