Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 29, 2017	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 409,942	$ 404,929
Accumulated depreciation	(202,455)	(196,310)
Property, plant and equipment, net	207,487	208,619
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	13,295	13,296
Buildings and related improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	105,290	105,154
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	266,106	263,575
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,808	6,744
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 18,443	$ 16,160