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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	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Net realized (gain) loss	$ 26,674	$ (3,089)
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	(89)	62
Borrowings	165,000	251,455
Repayments	0	(76,219)
Ending Balance	$ 608,791	$ 260,917

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