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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
	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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