Federal Income Tax Matters - Schedule of Tax Character of Distributions Paid (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Schedule of Investments [Abstract]
Ordinary Income	$ 209,607	$ 204,806	$ 189,204
Long-Term Capital Gains	$ 28,785	$ 0	$ 5,648