Leases (Lease-Related Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Assets:
Operating lease assets	$ 20,871	$ 19,370
Finance lease assets	690	781
Total lease assets	21,561	20,151
Current liabilities:
Operating lease liabilities	5,270	5,260
Finance lease liabilities	424	728
Noncurrent liabilities:
Operating lease liabilities	16,294	14,770
Finance lease liabilities	388	475
Total lease liabilities	$ 22,376	$ 21,233