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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, 2024	Sep. 30, 2023	Sep. 30, 2022
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Net realized (gain) loss	$ 222	$ (15,892)	$ (11,106)
Level 3 | Long-Term Credit Facility
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	85,619	167,563
Net change in unrealized (depreciation) appreciation included in earnings	26	2,090
Borrowings	606,455	65,000
Repayments	(248,220)	(224,709)
Net realized (gain) loss	0	(544)
Transfers in and/or out of Level 3	0	76,219
Ending Balance	$ 443,880	$ 85,619	$ 167,563

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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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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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