Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 71,866	$ 46,359
Accumulated depreciation	(34,643)	(28,143)
Property, plant, and equipment, net	37,223	18,216
Depreciation	7,100	5,600	$ 3,700
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,484	0
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	9,405	0
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	42,308	36,625
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	3,554	2,928
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	2,676	2,049
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 9,330	$ 3,648