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Taxes and Distributions - Summary of Components of Undistributed Taxable Income on Tax Basis and Reconciliation to Accumulated Deficit on Book Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
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Income Tax Disclosure [Abstract] |  |  |
Undistributed ordinary income – tax basis | $ 11,141 | $ 8,415 | $ 8,474
Short-term realized loss carried forward | (24,655) | (6,452) | (8,274)
Long-term realized loss carried forward | (65,977) | (59,136) | (40,147)
Distributions payable and other book to tax differences | 3,933 | (9,669) | (9,887)
Net unrealized appreciation (depreciation) of investments and debt | (15,423) | 18,600 | (11,087)
Total accumulated deficit – book basis | $ (90,981) | $ (48,242) | $ (60,920)

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