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Goodwill And Other Intangible Assets (Changes In Carrying Value Of Route Businesses) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Intangible Assets [Line Items]  
Document Period End Date Apr. 04, 2015
Routes Intangible Assets [Member]  
Intangible Assets [Line Items]  
January 3, 2015 16,880us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= lnce_RoutesIntangibleAssetsMember
Route businesses reclassified to assets held for sale (853)lnce_ChangeInRoutesReclassifiedToAssetsHeldForSale
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= lnce_RoutesIntangibleAssetsMember
April 4, 2015 16,027us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= lnce_RoutesIntangibleAssetsMember