Pension and Postretirement Benefit Plans Narrative (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013 Pension Plans	Sep. 29, 2012 Pension Plans	Sep. 28, 2013 Pension Plans	Sep. 29, 2012 Pension Plans	Dec. 29, 2012 Canadian Plans pension_plan	Dec. 29, 2012 Canadian Plans Special Charges Net	Dec. 29, 2012 Other Current Assets Canadian Plans
Defined Benefit Plan Disclosure [Line Items]
Number of liquidated pension plans									2
Current assets											$ 0
Curtailment / settlement (gain) loss					0	0	0	38,000		800,000
Contributions by employer					1,300,000		4,000,000
Employer contributions in 2013					5,300,000		5,300,000
Reclassed out of AOCI ($0.1 million for 3 months ended March 30, 2013 and less than $0.1 million in the three months ended March 31, 2012)	$ 100,000	$ 100,000	$ 300,000	$ 100,000