Fixed Assets (Narrative) (Details) (USD $)	3 Months Ended				3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013 Fixed assets held for sale	Dec. 29, 2012 Fixed assets held for sale	Mar. 30, 2013 Fixed Assets [Member]	Mar. 31, 2012 Fixed Assets [Member]	Mar. 31, 2012 Corsicana Manufacturing Facility Closing [Member] Cost of Sales [Member]	Dec. 29, 2012 Cambridge Manufacturing Facility Closing [Member] Machinery, equipment and computer systems
Property, Plant and Equipment [Abstract]
Depreciation expense related to fixed assets	$ 12,400,000	$ 11,700,000
Property, Plant and Equipment [Line Items]
Other Asset Impairment Charges					0	0		2,500,000
Asset Relocation Expense							1,400,000
Fixed assets held for sale			$ 2,834,000	$ 3,778,000