Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment by Major Asset Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 110,796	$ 108,025
Less: Accumulated depreciation	68,088	63,824
Property, plant and equipment, net	42,708	44,201
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	994	1,000
Buildings
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	16,931	15,564
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 92,871	$ 91,461