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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, 2024 | Sep. 30, 2023
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | $ 1,658,944 |  | $ 1,067,174 |
Cash and cash equivalents |  | 84,590 |  | 100,555 |
Total investments and cash and cash equivalents |  | 1,743,534 |  | 1,167,729 |
Credit Facility payable |  | 218,862 |  | 9,400 |
Total debt |  | 896,381 |  | 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 |  | 183,637 | [1] | 183,054 | [2]
2031 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 209,931 | [1] | 226,759 | [2]
2036 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1] | 283,951 |  |  |
First lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 1,449,206 |  | 906,166 |
Second lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 150 |  | 149 |
Subordinate debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 1,003 |  |  |
Equity |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 208,585 |  | 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 |  | 84,590 |  | 100,555 |
Total investments and cash and cash equivalents |  | 84,590 |  | 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 |  | 0 | [1] | 0 | [2]
Level 1 | 2031 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 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 | 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 |
Credit Facility payable |  | 0 |  | 0 |
Total debt |  | 183,637 |  | 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 |  | 183,637 | [1] | 183,054 | [2]
Level 2 | 2031 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 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 | 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 |  | 1,590,101 |  | 1,006,948 |
Cash and cash equivalents |  | 0 |  | 0 |
Total investments and cash and cash equivalents |  | 1,590,101 |  | 1,006,948 |
Credit Facility payable |  | 218,862 |  | 9,400 |
Total debt |  | 712,744 |  | 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 |  | 0 | [1] | 0 | [2]
Level 3 | 2031 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 209,931 | [1] | 226,759 | [2]
Level 3 | 2036 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1] | 283,951 |  |  |
Level 3 | First lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 1,449,206 |  | 906,166 |
Level 3 | Second lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 150 |  | 149 |
Level 3 | Subordinate debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 1,003 |  |  |
Level 3 | Equity |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 139,742 |  | 100,633 |
Measured at Net Asset Value |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 68,843 | [3] | 60,226 | [4]
Cash and cash equivalents |  | 0 | [3] | 0 | [4]
Total investments and cash and cash equivalents |  | 68,843 | [3] | 60,226 | [4]
Credit Facility payable |  | 0 | [3] | 0 | [4]
Total debt |  | 0 | [3] | 0 | [4]
Measured at Net Asset Value | 2023 Notes Payable |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [4] |  |  | 0 |
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 | 2031 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 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 |  | 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 |  | 0 | [3] | 0 | [4]
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 |  | $ 68,843 | [3] | $ 60,226 | [4]
[1] | We elected not to apply the fair value option allowed by ASC 825-10 to the 2026 Notes, 2031 Asset-Backed Debt, and 2036 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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