Income Taxes - Components of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Current:
Federal	$ 12
State	15	$ 35
Foreign	14,761	6,760	$ 5,844
Total current	14,788	6,795	5,844
Deferred:
Federal	(6,823)	5,437	(1,636)
State	218	5,001	(239)
Foreign	103,892	(14,857)	(8,693)
Total deferred	97,287	(4,419)	(10,568)
Provision for (benefit from) income taxes	$ 112,075	$ 2,376	$ (4,724)
Effective income tax rate	56.40%	4.90%	20.50%