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Taxes and Distributions - Summary of Reconciles Net (Decrease) Increase in Net Assets Resulting from Operations to Taxable Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
Net Income (Loss) $ 39,261 $ 3,453 $ 56,516
Net realized loss on investments 16,155 11,106 12,796
Net change in unrealized depreciation (appreciation) on investments and debt 12,075 34,023 (29,686)
Other book-to-tax differences (5,081) (549) 3,153
Other non-deductible expenses 1,924 993 846
Taxable income before dividends paid deduction $ 64,334 $ 49,026 $ 43,625