Leases - Summary of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Finance lease costs:
Amortization of right of use asset	$ 109	$ 73	$ 218	$ 214
Interest on lease liability	13	17	27	32
Operating lease cost	1,949	1,869	3,507	3,940
Variable lease cost	812	292	1,689	470
Sublease income	(47)	(51)	(95)	(104)
Total lease cost	$ 2,836	$ 2,200	$ 5,346	$ 4,552