Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 63,328	$ 71,866
Accumulated depreciation	(29,332)	(34,643)
Property, plant, and equipment, net	33,996	37,223
Gain on sale of equipment	1,600
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,484	3,484
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	9,405	9,405
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	33,374	42,308
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,109	1,109
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,629	3,554
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	2,688	2,676
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 9,639	$ 9,330