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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
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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

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