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Acquisitions (Acquired Hostess Bread Assets) - Additional Information (Detail) (Acquired Hostess Bread Asset, USD $)
0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Jul. 19, 2013
Oct. 05, 2013
Jan. 03, 2015
Dec. 28, 2013
Jan. 11, 2013
Apr. 20, 2013
Business Acquisition [Line Items]            
Business acquisition $ 355,342,000us-gaap_PaymentsToAcquireBusinessesGross          
Gain on legal settlement 1,400,000us-gaap_GainLossRelatedToLitigationSettlement 1,400,000us-gaap_GainLossRelatedToLitigationSettlement        
Sales related to acquisition     180,100,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual 26,600,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual    
Agreement Two
           
Business Acquisition [Line Items]            
Acquisition-related costs     0us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= flo_AcquiredHostessAssetsMember
/ us-gaap_TypeOfArrangementAxis
= flo_AgreementTwoMember
16,000,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= flo_AcquiredHostessAssetsMember
/ us-gaap_TypeOfArrangementAxis
= flo_AgreementTwoMember
   
Aggregate purchase price         30,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= flo_AcquiredHostessAssetsMember
/ us-gaap_TypeOfArrangementAxis
= flo_AgreementTwoMember
 
Breakup fee received for unsuccessful bid           $ 900,000us-gaap_BusinessAcquisitionPreacquisitionContingencyAmountOfSettlement
/ us-gaap_BusinessAcquisitionAxis
= flo_AcquiredHostessAssetsMember
/ us-gaap_TypeOfArrangementAxis
= flo_AgreementTwoMember
Bakeries
           
Business Acquisition [Line Items]            
Number of assets acquired in acquisition 20flo_BusinessCombinationNumberOfAcquisitionsAssetPurchase
/ us-gaap_BusinessAcquisitionAxis
= flo_AcquiredHostessAssetsMember
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= flo_BakeriesMember
         
Depots
           
Business Acquisition [Line Items]            
Number of assets acquired in acquisition 36flo_BusinessCombinationNumberOfAcquisitionsAssetPurchase
/ us-gaap_BusinessAcquisitionAxis
= flo_AcquiredHostessAssetsMember
/ us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis
= flo_DepotsMember