Leases - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Right Of Use Asset Obtained In Exchange for Lease Liability [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 0	$ 911
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation	919	0
Cash paid for leases [Abstract]
Right-of-use assets obtained in exchange for new operating lease liability	0	2,892
Leasehold Improvements, Gross	0	1,000
Non-cash Tenant Improvement Allowance [Abstract]
Tenant improvement allowance	$ 0	$ (1,000)
Weighted average remaining lease term [Abstract]
Weighted average remaining lease term- operating leases	8 years 4 months 24 days
Weighted Average Discount Rate Leases [Abstract]
Weighted average discount rate - operating leases	3.10%