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Fair Value of Financial Instruments - Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - Level 3 - Long-Term Credit Facility - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 206,940 $ 376,687
Net change in unrealized (depreciation) appreciation included in earnings 4,385 3,753
Borrowings [1] 524,036 152,500
Repayments [1] (275,000) (326,000)
Ending Balance $ 460,361 $ 206,940
[1] Excludes temporary draws.