Income Taxes - Components of the Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended		12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Domestic	$ 4,191			$ 2,422		$ 3,753	$ (942)
Foreign	2,025			(9,129)		(6,952)	(2,996)
Provision for (benefit from) income taxes	$ 6,216	$ (9,415)	$ (2,211)	$ (6,707)	$ 2,769	$ (3,199)	$ (3,938)	$ (4,724)
Effective income tax rate	35.80%			(109.90%)		(11.10%)	163.50%