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Fair Value of Financial Instruments - Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Net realized (gain) loss | $ 8,355 | $ 568
Level 3 | Long-Term Credit Facility |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 443,880 | 85,619
Net change in unrealized (depreciation) appreciation included in earnings | (15) | 7
Borrowings | 260,000 | 381,455
Repayments | (405,000) | (248,219)
Ending Balance | $ 298,865 | $ 218,862

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