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Postretirement Plans - Additional Information (Detail) (USD $)
 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2014
Employee
Apr. 25, 2015
Apr. 19, 2014
Dec. 31, 2014
Jan. 03, 2015
Jan. 03, 2015
Pension and Other Postretirement Benefits Disclosure [Line Items]            
Number of former employees covered 2,500us-gaap_DefinedContributionPlanNumberOfEmployeesCovered          
Percentage reduced in plan obligations 10.00%flo_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecreasePercentage          
Pension contributions   $ 2,500,000us-gaap_PensionContributions $ 5,029,000us-gaap_PensionContributions      
Expected pension income for fiscal 2015   7,500,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear        
Total cost and employer contributions   8,500,000us-gaap_DefinedContributionPlanCostRecognized 8,400,000us-gaap_DefinedContributionPlanCostRecognized      
Plan No. 1            
Pension and Other Postretirement Benefits Disclosure [Line Items]            
Distributions from existing plan assets       48,400,000us-gaap_DefinedBenefitPlanSettlementsPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= flo_PlanOneMember		    
Settlement loss         15,400,000us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= flo_PlanOneMember		  
Plan No. 2            
Pension and Other Postretirement Benefits Disclosure [Line Items]            
Distributions from existing plan assets       2,000,000us-gaap_DefinedBenefitPlanSettlementsPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= flo_PlanTwoMember		    
Settlement loss           $ 0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= flo_PlanTwoMember