Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating lease cost	$ 551	$ 598	$ 1,695	$ 1,835
Less: sublease income	(171)	(175)	(519)	(532)
Variable lease cost	114	117	372	334
Short-term lease cost	413	365	1,266	853
Total lease cost	$ 907	$ 905	$ 2,814	$ 2,490