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Percentage of Sales from Largest Customers (Detail) (Sales Revenue, Net, Wal-Mart/Sam's Club) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Revenue, Major Customer [Line Items] |  |  |
Percentage of sales, Total | 19.50%us-gaap_ConcentrationRiskPercentage1 | 20.20%us-gaap_ConcentrationRiskPercentage1 | 20.80%us-gaap_ConcentrationRiskPercentage1
DSD Segment |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of sales, Total | 16.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = flo_WalmartSamsClubMember / us-gaap_StatementBusinessSegmentsAxis = flo_DirectStoreDeliveryMember | 17.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = flo_WalmartSamsClubMember / us-gaap_StatementBusinessSegmentsAxis = flo_DirectStoreDeliveryMember | 16.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = flo_WalmartSamsClubMember / us-gaap_StatementBusinessSegmentsAxis = flo_DirectStoreDeliveryMember
Warehouse Segment |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of sales, Total | 2.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = flo_WalmartSamsClubMember / us-gaap_StatementBusinessSegmentsAxis = flo_WarehouseDeliveryMember | 3.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = flo_WalmartSamsClubMember / us-gaap_StatementBusinessSegmentsAxis = flo_WarehouseDeliveryMember | 3.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = flo_WalmartSamsClubMember / us-gaap_StatementBusinessSegmentsAxis = flo_WarehouseDeliveryMember

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