Income Taxes - Components of the Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Domestic	$ 1,437	$ (438)
Foreign	(1,138)	(8,977)
Provision for (benefit from) income taxes	$ 299	$ (9,415)
Effective income tax rate	1.50%	(81.70%)