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Taxes and Distributions - Summary of Tax Characteristics of Distributions Declared (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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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Amount of accumulated undistributed tax basis earnings (deficit).

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Amount of accumulated undistributed earnings (deficit) from ordinary income (loss) of investment company.

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Per share or unit amount of distribution to shareholders. Includes, but is not limited to, dividend and capital gain. Excludes distribution for tax return of capital.

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