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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, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]      
Net increase in net assets resulting from operations $ 3,453 $ 56,516 $ 18,413
Net realized loss on investments 11,106 12,796 12,682
Net change in unrealized depreciation (appreciation) on investments and debt 34,023 (29,686) 12,290
Other book-to-tax differences (549) 3,153 (2,424)
Other non-deductible expenses 993 846 757
Taxable income before dividends paid deduction $ 49,026 $ 43,625 $ 41,718