Effect of Largest Customer in Sales (Detail) - Total year to date sales - Customer Concentration Risk	3 Months Ended		9 Months Ended
	Oct. 07, 2017	Oct. 08, 2016	Oct. 07, 2017	Oct. 08, 2016
DSD Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage			85.00%
Warehouse Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage			15.00%
Wal-Mart/Sam's Club
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	20.10%	19.80%	20.10%	19.70%
Wal-Mart/Sam's Club | DSD Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	17.60%	17.20%	17.70%	17.00%
Wal-Mart/Sam's Club | Warehouse Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	2.50%	2.60%	2.40%	2.70%