Capital Assets (Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Sep. 29, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 271,702	$ 268,223
Less: Accumulated depreciation	(182,436)	(177,954)
Total property and equipment, net	89,266	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	58,750	58,880
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	207,275	203,647
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,796	$ 2,815