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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
Dec. 31, 2022
Sep. 30, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments $ 1,151,137 $ 1,164,254
Cash and cash equivalents 52,935 47,880
Total investments and cash and cash equivalents 1,204,072 1,212,134
Credit Facility payable 197,688 167,563
Total debt 680,278 672,779
2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 73,833 96,812
2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 182,471 182,276
2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 226,286 226,128
First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 998,209 1,009,642
Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 147 147
Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 152,781 154,465
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 52,935 47,880
Total investments and cash and cash equivalents 52,935 47,880
Total debt 73,833 96,812
Level 1 | 2023 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 73,833 96,812
Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 182,471 182,276
Level 2 | 2026 Notes Payable    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 182,471 182,276
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 1,093,814 1,104,927
Total investments and cash and cash equivalents 1,093,814 1,104,927
Credit Facility payable 197,688 167,563
Total debt 423,974 393,691
Level 3 | 2031 Asset-Backed Debt    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total debt 226,286 226,128
Level 3 | First lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 998,209 1,009,642
Level 3 | Second lien    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 147 147
Level 3 | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 95,458 95,138
Measured at Net Asset Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments 57,323 59,327
Total investments and cash and cash equivalents 57,323 59,327
Measured at Net Asset Value | Equity    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments $ 57,323 $ 59,327