Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Current:
Federal	$ (561)	$ 611	$ 12
State	32	38	15
Foreign	8,655	11,619	14,761
Total current	8,126	12,268	14,788
Deferred:
Federal	(4,596)	7,941	(6,823)
State	219	(1,164)	218
Foreign	(281)	820	103,892
Total deferred	(4,658)	7,597	97,287
Provision for income taxes	$ 3,468	$ 19,865	$ 112,075
Effective income tax rate	(0.60%)	(54.60%)	(56.40%)