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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Net realized (gain) loss $ (15,892) $ (11,106) $ (12,796)
Level 3 | Long-Term Credit Facility      
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Beginning Balance 167,563 218,851  
Net change in unrealized (depreciation) appreciation included in earnings 2,090 (1,542)  
Borrowings 65,000 147,254  
Repayments (224,709) 197,000  
Net realized (gain) loss (544) 0  
Transfers in and/or out of Level 3 76,219 0  
Ending Balance $ 85,619 $ 167,563 $ 218,851