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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, 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

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