Income Taxes - Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Domestic	$ (58,889)	$ (4,995)
Foreign	24,880	14,252
(Loss) income before income taxes	$ (34,009)	$ 9,257