Income Taxes - Schedule of Provision For (Benefit From) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Federal	$ 7,311	$ 767	$ 4,774
State	10,020	6,675	1,609
Foreign	53,019	33,612	66,554
Current provision for income taxes	70,350	41,054	72,937
Federal	(11,821)	25,730	(152,311)
State	(10,028)	(3,177)	(27,228)
Foreign	38,525	20,410	21,434
Deferred provision for (benefit from) income taxes	16,676	42,963	(158,105)
Provision (benefit) for income taxes	$ 87,026	$ 84,017	$ (85,168)