Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment by Major Asset Class (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 108,025
Total property, plant and equipment		$ 99,148
Less: Accumulated depreciation	63,824
Less: Accumulated depreciation		59,538
Property, plant and equipment, net	44,201
Property, plant and equipment, net		39,610
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,000
Total property, plant and equipment		964
Buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	15,564
Total property, plant and equipment		15,805
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 91,461
Total property, plant and equipment		$ 82,379