Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flow, Operating Activities, Lessee [Abstract]
Operating cash flows from operating leases	$ 6,213	$ 5,334
Operating cash flows from finance leases	41	96
Financing cash flows from finance leases	$ 1,130	$ 1,181