Postretirement Plans - Summary of Weighted-Average Discount Rates Used to Determine Postretirement Health Care Expenses (Detail)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.30%	4.50%	5.30%
U.S. Postretirement Health Care Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.20%	3.80%	4.30%