Leases - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Right Of Use Asset Obtained In Exchange for Lease Liability [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 0	$ 1,784
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation	919	0	$ 919	$ 0
Cash paid for leases [Abstract]
Right-of-use assets obtained in exchange for new operating lease liability	$ 0	3,238
Tenant improvement allowance		$ 1,000	$ 0	$ 1,000
Weighted average remaining lease term [Abstract]
Weighted average remaining lease term- operating leases	8 years 6 months		8 years 6 months
Weighted Average Discount Rate Leases [Abstract]
Weighted average discount rate - operating leases	2.70%		2.70%