Commitments and Contingencies - Additional Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Weighted average remaining lease term (years)	9 years 9 months 18 days	11 years 10 months 24 days
Weighted average discount rate	5.40%	6.10%
Operating cash outflows from operating leases	$ 2,781	$ 1,975
Right-of-use assets obtained in exchange for operating lease liabilities	$ 1,529	$ 10,358