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Plan Asset and Target Asset Allocations (Detail)	12 Months Ended
	Jan. 03, 2015		Dec. 28, 2013
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations		100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Equity Securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2014, Minimum	40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember
Target Allocation 2014, Minimum	60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember
Percentage of Plan Assets at the Measurement Date	55.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember		56.60%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember
Fixed Income Securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2014, Minimum	10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember
Target Allocation 2014, Minimum	40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember
Percentage of Plan Assets at the Measurement Date	7.10%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember		9.60%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember
Real Estate Funds
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2014, Minimum	0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember
Target Allocation 2014, Minimum	25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember
Percentage of Plan Assets at the Measurement Date	3.90%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember		3.10%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember
Other Diversifying Strategies
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2014, Minimum	0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_OtherDiversifyingStrategiesMember	[1]
Target Allocation 2014, Minimum	40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_OtherDiversifyingStrategiesMember	[1]
Percentage of Plan Assets at the Measurement Date	33.20%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_OtherDiversifyingStrategiesMember	[1]	29.80%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_OtherDiversifyingStrategiesMember	[1]
Short Term Investments And Cash
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2014, Minimum	0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_ShortTermInvestmentsAndCashMember
Target Allocation 2014, Minimum	25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_ShortTermInvestmentsAndCashMember
Percentage of Plan Assets at the Measurement Date	0.80%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_ShortTermInvestmentsAndCashMember		0.90%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_ShortTermInvestmentsAndCashMember
[1] Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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