Detail of Selected Balance Sheet Accounts - Schedule of Property, Plant And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 258,117	$ 256,233
Less: Accumulated depreciation	(143,745)	(135,421)
Total property, plant and equipment, net	114,372	120,812
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	22,008	21,963
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 122,529	122,404
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Asset lives	3 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Asset lives	39 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 108,439	106,137
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Asset lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Asset lives	15 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 3,611	3,611
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Asset lives	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Asset lives	10 years
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 1,530	$ 2,118