Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 43,214	$ 71,866
Accumulated depreciation	(22,320)	(34,643)
Property, plant, and equipment, net	20,894	37,223
Gain on sale of equipment	1,600
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross		3,484
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross		9,405
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	26,891	42,308
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,004	1,109
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,502	3,554
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,019	2,676
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 8,798	$ 9,330