Income Taxes - Schedule of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
U.S.	$ 21,243	$ 11,859	$ (2,103)
Foreign	(913)	475	(5,596)
Income (loss) before income taxes	$ 20,330	$ 12,334	$ (7,699)