Income Taxes - Components of Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Domestic	$ 104,432	$ 57,138	$ (124,227)
Foreign	(20,426)	(56,138)	(44,483)
Income (loss) before income tax	$ 84,006	$ 1,000	$ (168,710)