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Percentage of Sales from Largest Customers (Detail) (Sales Revenue, Net, Wal-Mart/Sam's Club)
12 Months Ended
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