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Effect of Largest Customer in Sales (Detail) - Total year to date sales - Customer Concentration Risk | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 14, 2018 | Jul. 15, 2017 | Jul. 14, 2018 | Jul. 15, 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 | 20.80% | 20.60% | 20.30% | 20.10%
Wal-Mart/Sam's Club | DSD Segment |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 18.40% | 18.30% | 17.90% | 17.70%
Wal-Mart/Sam's Club | Warehouse Segment |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 2.40% | 2.30% | 2.40% | 2.40%

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