Capital Assets (Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 264,928	$ 262,575
Less: Accumulated depreciation	(167,309)	(162,645)
Total property and equipment, net	97,619	99,930
Land and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	2,867	2,867
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	61,119	60,340
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	198,127	196,621
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,815	$ 2,747