Capital Assets (Property and Equipment) (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Sep. 29, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 284,397	$ 268,223
Less: Accumulated depreciation	(191,504)	(177,954)
Total property and equipment, net	92,893	90,269
Land and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	3,924	2,881
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	59,949	58,880
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	217,728	203,647
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,796	$ 2,815