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Taxes and Distributions - Summary of Amounts Reclassified for Tax Purposes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |
Decrease in paid-in capital | $ (492) | $ (369) | $ (481)
Decrease in accumulated net realized loss | 1,118 | (292) | (263)
Increase in undistributed net investment income | $ (625) | $ 661 | $ 745

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