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, 2023 |
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2019 |
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Income Tax Disclosure [Abstract] | |||||||||
Ordinary income (including short-term gains, if any) | $ 60,451 | $ 46,685 | $ 44,207 | ||||||
Total distributions | $ 60,451 | $ 46,685 | $ 44,207 | ||||||
Total distributions per share based on weighted average shares | [1],[2] | $ 1.19 | $ 1.14 | $ 1.14 | $ 1.14 | $ 1.14 | |||
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