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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
May 21, 2014
Jan. 03, 2015
Omnibus Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Additional awards that will be issued under the EPIP 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= flo_OmnibusPlanMember
 
Awards granted, authorized amount 8,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= flo_OmnibusPlanMember
 
Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding average exercise price   $ 10.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_EmployeeStockOptionMember
Weighted average remaining contractual life   2 years 3 months 7 days
Aggregate intrinsic value   $ 51.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_EmployeeStockOptionMember