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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
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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.

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