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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
Net increase in net assets resulting from operations $ 66,365 $ 91,839 $ 39,261
Net realized gain (loss) on investments 6,046 (177) 16,155
Net realized gain (loss) on debt 0 383 0
Net change in unrealized depreciation (appreciation) on investments and debt 34,743 (14,324) 12,075
Other book-to-tax differences 1,668 11,435 (5,081)
Other non-deductible expenses 1,929 2,220 1,924
Taxable income before dividends paid deduction $ 110,751 $ 91,376 $ 64,334