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Assets Held for Sale - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Jul. 12, 2014
Jan. 03, 2015
Jan. 03, 2015
Aug. 13, 2014
Long Lived Assets Held-for-sale [Line Items]        
Cash consideration of discontinued operation       $ 8,400,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Carrying value of the assets held for sale       7,600,000us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets
Goodwill impairment loss 2,600,000us-gaap_GoodwillImpairmentLoss 2,624,000us-gaap_GoodwillImpairmentLoss    
Impairment loss of scrapped assets   1,900,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf    
Gain on divestiture of discontinued operation   1,800,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax    
Gain on property plan and equipment   800,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment    
Cost incurred in severance and inventory   800,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold    
Total cost of divestiture   3,500,000us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts    
Acquired Hostess Bread Assets Classified as Held for Sale        
Long Lived Assets Held-for-sale [Line Items]        
Impairment loss of scrapped assets     5,800,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldForSaleMember
 
Acquired Hostess Bread Assets Plants and Depots        
Long Lived Assets Held-for-sale [Line Items]        
Cash consideration of discontinued operation   $ 24,200,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= flo_AcquiredHostessAssetsPlantsAndDepotsMember
$ 24,200,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= flo_AcquiredHostessAssetsPlantsAndDepotsMember
 
Number of Acquired Hostess Bread Asset depots sold   22flo_NumberOfLongLivedAssetsHeldForSaleSold
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= flo_AcquiredHostessAssetsPlantsAndDepotsMember