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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%

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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