Leases (Lease-Related Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Assets:
Operating lease assets	$ 21,935	$ 18,918
Finance lease assets	970	1,201
Total lease assets	22,905	20,119
Current liabilities:
Operating lease liabilities	5,280	4,925
Finance lease liabilities	1,398	1,634
Noncurrent liabilities:
Operating lease liabilities	17,178	14,569
Finance lease liabilities	620	1,173
Total lease liabilities	$ 24,476	$ 22,301