Income Taxes - Schedule of Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefit, beginning of year	$ 21,166	$ 16,107	$ 11,484
Tax positions related to current year:
Additions	3,144	4,844	2,173
Tax positions related to prior years:
Additions	785	30,130	2,452
Reductions	(1,172)	(478)	(2)
Settlements		(29,437)	0
Unrecognized tax benefit, end of year	$ 23,923	$ 21,166	$ 16,107