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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
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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 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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