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Taxes and Distributions - Summary of Amounts Reclassified for Tax Purposes (Details) - USD ($)
$ in Thousands
12 Months Ended
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