Effect of Largest Customer in Sales (Detail) - Total year to date sales - Customer Concentration Risk	4 Months Ended
	Apr. 21, 2018	Apr. 22, 2017
DSD Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	84.00%
Warehouse Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	16.00%
Wal-Mart/Sam's Club
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	20.00%	19.80%
Wal-Mart/Sam's Club | DSD Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	17.60%	17.30%
Wal-Mart/Sam's Club | Warehouse Segment
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	2.40%	2.50%