Employee Benefit Plans and Collective Bargaining Agreements (Actuarial Assumptions Used to Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011		Jan. 01, 2011
Combined weighted-average rate [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.80%		5.55%		6.10%
United States plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.94%		5.69%		6.20%
Expected return on plan assets	7.50%	[1]	7.75%	[1]	8.50%	[1]	8.50%	[1]
Rate of compensation increase			3.00%		3.00%		3.00%
Canadian plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.25%		5.00%		5.80%
Expected return on plan assets	6.25%	[2]	6.50%	[2]	6.75%	[2]	7.00%	[2]
Rate of compensation increase			2.75%		2.50%		3.00%

[1] Reduced to 7.50% in 2013.

[2] Reduced to 6.25% in 2013.