Percentage of Sales From Largest Customers (Detail) (Wal-Mart/Sam's Club)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Revenue, Major Customer [Line Items]
Percentage of sales, Total	20.70%	21.60%	21.80%
DSD
Revenue, Major Customer [Line Items]
Percentage of sales, Total	17.50%	17.80%	18.20%
Warehouse
Revenue, Major Customer [Line Items]
Percentage of sales, Total	3.20%	3.80%	3.60%