Effect of Largest Customer in Sales (Detail) - Total year to date sales - Customer Concentration Risk	3 Months Ended		6 Months Ended
	Jul. 15, 2017	Jul. 16, 2016	Jul. 15, 2017	Jul. 16, 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	20.60%	20.20%	20.10%	19.60%
Wal-Mart/Sam's Club | DSD Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	18.30%	17.60%	17.70%	16.90%
Wal-Mart/Sam's Club | Warehouse Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	2.30%	2.60%	2.40%	2.70%