Capital Assets (Property and Equipment) (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Sep. 28, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 308,145	$ 295,569
Less: Accumulated depreciation	(207,985)	(194,486)
Total property and equipment, net	100,160	101,083
Land and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	3,957	3,949
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	72,927	64,140
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 231,261	224,684
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 2,796