Leases - Supplemental Balance Sheet Information Schedule (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Leases [Abstract]
Property, plant and equipment, net	$ 116
Operating lease right-of-use assets, net	17,699
Total lease assets	17,815
Current maturities of long-term debt	57
Short-term operating lease liabilities	1,195	$ 0
Long-term debt, net of current maturities	51
Long-term operating lease liabilities, net of short-term	16,576	$ 0
Total lease liabilities	$ 17,879