Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment by Major Asset Class (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 91,169	$ 99,037
Accumulated depreciation	51,661	50,079
Property, plant and equipment, net	39,508	48,958
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,005	979
Buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	15,084	15,393
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 75,080	$ 82,665