Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment by Major Asset Class (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 92,825	$ 91,169
Less: Accumulated depreciation	57,435	51,661
Property, plant and equipment, net	35,390	39,508
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	995	1,005
Buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	15,365	15,084
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 76,465	$ 75,080