Leases - Lease Cost Components Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Finance lease expense:
Amortization of right-of use assets on finance leases	$ 2	$ 13	$ 16	$ 41
Interest on lease liabilities	0	1	1	2
Operating lease expense	425	431	1,283	1,523
Variable lease cost	29	34	89	104
Total lease expense	$ 456	$ 479	$ 1,389	$ 1,670