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Performance Contingent Total Shareholder Return Shares (Detail) (Total Shareholders Return)
 12 Months Ended
Jan. 03, 2015
90th Percentile
  
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]  
Percentile 90.00%flo_PercentileRankOfShareholderReturnOfStock
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupOneMember
Payout as % of Target 200.00%flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetPercentage
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupOneMember
70th Percentile
  
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]  
Percentile 70.00%flo_PercentileRankOfShareholderReturnOfStock
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupTwoMember
Payout as % of Target 150.00%flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetPercentage
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupTwoMember
50th Percentile
  
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]  
Percentile 50.00%flo_PercentileRankOfShareholderReturnOfStock
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupThreeMember
Payout as % of Target 100.00%flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetPercentage
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupThreeMember
30th Percentile
  
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]  
Percentile 30.00%flo_PercentileRankOfShareholderReturnOfStock
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupFourMember
Payout as % of Target 50.00%flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetPercentage
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupFourMember
Below 30th Percentile
  
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]  
Percentile 30.00%flo_PercentileRankOfShareholderReturnOfStock
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupFiveMember
Payout as % of Target 0.00%flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetPercentage
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= flo_TotalShareholdersReturnMember
/ us-gaap_VestingAxis
= flo_GroupFiveMember