Taxes and Distributions - Summary of Amounts Reclassified for Tax Purposes (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Decrease in paid-in capital	$ (531)	$ (492)	$ (369)
Decrease in accumulated net realized loss	(1,645)	1,118	(292)
Increase in undistributed net investment income	$ 2,176	$ (625)	$ 661

Increase (decrease) in accumulated net realized gain for tax purposes.

No definition available.

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