Income Taxes - Schedule of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
U.S.	$ 3,076	$ 21,243	$ 11,859
Foreign	(1,984)	(913)	475
Income before income taxes	$ 1,092	$ 20,330	$ 12,334