Leases - Supplemental Balance Sheet Information Schedule (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
ASSETS
Property, plant and equipment, net	$ 89
Operating lease right-of-use assets, net	17,021	$ 0
Total lease assets	17,110
Current liabilities:
Current maturities of long-term debt	58
Short-term operating lease liabilities	991	0
Liabilities, Noncurrent [Abstract]
Long-term debt, net of current maturities	22
Long-term operating lease liabilities, net of short-term	16,188	$ 0
Total lease liabilities	$ 17,259
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent