Leases - Supplemental Balance Sheet Information Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Assets:
Property, plant and equipment, net	$ 22	$ 34
Operating lease right-of-use assets, net	15,709	15,943
Total lease assets	15,731	15,977
Current liabilities:
Current maturities of long-term debt	10	17
Short-term operating lease liabilities	782	788
Non-current liabilities:
Long-term debt, net of current maturities	3	5
Long-term operating lease liabilities, net of short-term	15,248	15,439
Total lease liabilities	$ 16,043	$ 16,249
Finance lease, asset, statement of financial position [Extensible List]	Property, plant and equipment, net	Property, plant and equipment, net
Current finance lease, liability, statement of financial position [Extensible List]	Current maturities of long-term debt	Current maturities of long-term debt
Noncurrent finance lease, liability, statement of financial position [Extensible List]	Total long-term debt	Total long-term debt