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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	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Net realized (gain) loss	$ 921	$ (7,455)
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	23	(1,865)
Borrowings	331,455	30,000
Repayments	(248,219)	(48,000)
Net realized (gain) loss	0	0
Ending Balance	$ 168,878	$ 147,698

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- Definition

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

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- Definition

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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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
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Amount of sales 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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Fair value 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 realized gain (loss) on investment.

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-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
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