Leases (Lease-Related Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Assets:
Operating lease assets	$ 19,370	$ 18,918
Finance lease assets	781	1,201
Total lease assets	20,151	20,119
Current liabilities:
Operating lease liabilities	$ 5,260	$ 4,925
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Finance lease liabilities	$ 728	$ 1,634
Noncurrent liabilities:
Operating lease liabilities	$ 14,770	$ 14,569
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Finance lease liabilities	$ 475	$ 1,173
Total lease liabilities	$ 21,233	$ 22,301