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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
Net increase in net assets resulting from operations $ 91,839 $ 39,261 $ 3,453
Net realized gain (loss) on investments (177) 16,155 11,106
Net realized gain (loss) on debt 383 0 0
Net change in unrealized depreciation (appreciation) on investments and debt (14,324) 12,075 34,023
Other book-to-tax differences 11,435 (5,081) (549)
Other non-deductible expenses 2,220 1,924 993
Taxable income before dividends paid deduction $ 91,376 $ 64,334 $ 49,026