Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Operating lease expense*	$ 16,789	$ 14,616	$ 33,151	$ 29,815
Variable lease expense	3,834	2,064	7,376	4,243
Total lease expense	$ 20,623	$ 16,680	$ 40,527	$ 34,058