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 |