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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	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Net realized (gain) loss	$ (5,941)	$ 222	$ (15,892)
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	(43)	26
Borrowings	645,000	606,455
Repayments	(405,000)	(248,220)
Ending Balance	$ 683,837	$ 443,880	$ 85,619

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Fair value measurement with unobservable inputs reconciliation recurring basis liability net change in unrealized depreciation appreciation included in earnings.

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