Leases - Components of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Lease Cost
Operating lease cost	$ 8,510	$ 8,676	$ 16,564	$ 17,536
Short-term lease cost	1,724	582	2,487	1,123
Variable lease cost	2,759	2,596	5,389	5,086
Sublease income	(1,201)	(1,113)	(2,386)	(2,230)
Total lease cost	$ 11,792	$ 10,741	$ 22,054	$ 21,515