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Taxes and Distributions - Summary of Tax Characteristics of Distributions Declared (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Ordinary income (including short-term gains, if any) | $ 46,685 | $ 44,207 | $ 44,200 |  |
Total distributions | $ 46,685 | $ 44,207 | $ 44,200 |  |
Total distributions per share based on weighted average shares | $ 1.14 | $ 1.14 | $ 1.14 | $ 1.14 | $ 1.14

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