Leases (Lease-Related Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Assets:
Operating lease assets	$ 21,220	$ 18,918
Finance lease assets	886	1,201
Total lease assets	22,106	20,119
Current liabilities:
Operating lease liabilities	5,571	4,925
Finance lease liabilities	1,050	1,634
Noncurrent liabilities:
Operating lease liabilities	16,342	14,569
Finance lease liabilities	556	1,173
Total lease liabilities	$ 23,519	$ 22,301