Leases - Supplemental Cash Flow Information and Non-Cash Activity Schedule (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts included in measurement of liabilities:
Operating cash flows from operating leases	$ 1,525	$ 1,628
Operating cash flows from finance leases	2	4
Financing cash flows from finance leases	44	42
Right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	$ 43	$ 278