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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
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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.

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