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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
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Jun. 30, 2023 | Jun. 30, 2022
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Net realized (gain) loss | $ (13,520) | $ (11,621)
Level 3 | Long-Term Credit Facility |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 167,563 | 218,852
Net change in unrealized (depreciation) appreciation included in earnings | 1,607 | (5,663)
Borrowings | 65,000 | 147,254
Repayments | (169,709) | (107,000)
Net realized (gain) loss | (544) | 0
Ending Balance | $ 63,917 | $ 253,443

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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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