Capital Assets (Property and Equipment) (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Sep. 29, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 274,434	$ 268,223
Less: Accumulated depreciation	(186,308)	(177,954)
Total property and equipment, net	88,126	90,269
Land and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	2,881	2,881
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	58,692	58,880
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	210,065	203,647
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,796	$ 2,815