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Effect of Largest Customer in Sales (Detail) (Wal-Mart/Sam's Club) | 4 Months Ended
--- | ---
Apr. 20, 2013 | Apr. 21, 2012
Revenue, Major Customer [Line Items] |  |
Percentage of sales, Total | 20.40% | 21.30%
DSD |  |
Revenue, Major Customer [Line Items] |  |
Percentage of sales, Total | 16.90% | 17.60%
Warehouse Delivery |  |
Revenue, Major Customer [Line Items] |  |
Percentage of sales, Total | 3.50% | 3.70%

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- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration