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Summary Of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 4 Months Ended 12 Months Ended 0 Months Ended
Jan. 03, 2015
Oct. 04, 2014
Jul. 12, 2014
Dec. 28, 2013
Oct. 05, 2013
Jul. 13, 2013
Apr. 19, 2014
Apr. 20, 2013
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Apr. 03, 2012
Significant Accounting Policies [Line Items]                        
Sales $ 877,333,000us-gaap_SalesRevenueGoodsNet $ 844,932,000us-gaap_SalesRevenueGoodsNet $ 872,791,000us-gaap_SalesRevenueGoodsNet $ 839,989,000us-gaap_SalesRevenueGoodsNet $ 874,129,000us-gaap_SalesRevenueGoodsNet $ 893,576,000us-gaap_SalesRevenueGoodsNet $ 1,153,917,000us-gaap_SalesRevenueGoodsNet $ 1,124,922,000us-gaap_SalesRevenueGoodsNet $ 3,748,973,000us-gaap_SalesRevenueGoodsNet $ 3,732,616,000us-gaap_SalesRevenueGoodsNet $ 3,031,124,000us-gaap_SalesRevenueGoodsNet  
Inventory 93,100,000us-gaap_InventoryNet     100,851,000us-gaap_InventoryNet         93,100,000us-gaap_InventoryNet 100,851,000us-gaap_InventoryNet    
Deferred gain on sale of assets held for sale 25,700,000us-gaap_DeferredGainOnSaleOfProperty     22,400,000us-gaap_DeferredGainOnSaleOfProperty         25,700,000us-gaap_DeferredGainOnSaleOfProperty 22,400,000us-gaap_DeferredGainOnSaleOfProperty    
Net gain on sale of territories                 3,800,000us-gaap_GainLossOnDispositionOfIntangibleAssets 5,500,000us-gaap_GainLossOnDispositionOfIntangibleAssets 2,600,000us-gaap_GainLossOnDispositionOfIntangibleAssets  
Shipping costs                 847,600,000us-gaap_ShippingHandlingAndTransportationCosts 797,400,000us-gaap_ShippingHandlingAndTransportationCosts 675,600,000us-gaap_ShippingHandlingAndTransportationCosts  
Equipment held under capital leases 28,900,000us-gaap_CapitalLeasedAssetsGross     22,500,000us-gaap_CapitalLeasedAssetsGross         28,900,000us-gaap_CapitalLeasedAssetsGross 22,500,000us-gaap_CapitalLeasedAssetsGross    
Total accumulated depreciation for assets held under capital leases 6,300,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation     7,000,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation         6,300,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation 7,000,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation    
Depreciation expense                 117,200,000us-gaap_Depreciation 106,700,000us-gaap_Depreciation 93,400,000us-gaap_Depreciation  
Impairment of long-lived assets held and used                 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse  
Impairment of Intangible Assets excluding goodwill                 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill  
Goodwill impairment loss     2,600,000us-gaap_GoodwillImpairmentLoss           2,624,000us-gaap_GoodwillImpairmentLoss      
Advertising and marketing costs                 22,900,000us-gaap_MarketingAndAdvertisingExpense 28,100,000us-gaap_MarketingAndAdvertisingExpense 19,100,000us-gaap_MarketingAndAdvertisingExpense  
Amortization expense of capitalized software development costs                 2,400,000us-gaap_CapitalizedComputerSoftwareAmortization 3,200,000us-gaap_CapitalizedComputerSoftwareAmortization 1,600,000us-gaap_CapitalizedComputerSoftwareAmortization  
Capitalized software development costs 13,000,000us-gaap_CapitalizedComputerSoftwareGross     14,800,000us-gaap_CapitalizedComputerSoftwareGross         13,000,000us-gaap_CapitalizedComputerSoftwareGross 14,800,000us-gaap_CapitalizedComputerSoftwareGross    
Plan asset amortization conditional percentage                 10.00%flo_PercentageOfUnrecognizedGainLossOnPensionPlanAssetsFairValueAmortization      
Pay By Scan                        
Significant Accounting Policies [Line Items]                        
Sales                 1,206,600,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_TypeOfArrangementAxis
= flo_PayByScanMember		 1,116,400,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_TypeOfArrangementAxis
= flo_PayByScanMember		 863,400,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_TypeOfArrangementAxis
= flo_PayByScanMember		  
Inventory 6,100,000us-gaap_InventoryNet
/ us-gaap_TypeOfArrangementAxis
= flo_PayByScanMember		     6,400,000us-gaap_InventoryNet
/ us-gaap_TypeOfArrangementAxis
= flo_PayByScanMember		         6,100,000us-gaap_InventoryNet
/ us-gaap_TypeOfArrangementAxis
= flo_PayByScanMember		 6,400,000us-gaap_InventoryNet
/ us-gaap_TypeOfArrangementAxis
= flo_PayByScanMember		    
Senior Notes Issued                        
Significant Accounting Policies [Line Items]                        
Debt instrument face amount                       400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= flo_SeniorNotesOneMember
Debt issuance cost, amortization period                       10 years
Maximum                        
Significant Accounting Policies [Line Items]                        
Percentage of distributor route notes receivables                 10.00%flo_PercentageOfDistributorRouteNotesReceivables
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Gain on sale of territories recognized immediately                 $ 5,000flo_RealizedGainsLossOnSalesOfAssets
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Finite-lived intangible asset amortization periods                 40 years      
Maximum | Building                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 40 years      
Maximum | Machinery and Equipment                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 25 years      
Maximum | Furniture Fixtures And Transportation Equipment                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 15 years      
Maximum | Capitalized Software Development Costs                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 8 years      
Maximum | Sale of Territory                        
Significant Accounting Policies [Line Items]                        
Notes receivable maturity period                 10 years      
Minimum                        
Significant Accounting Policies [Line Items]                        
Finite-lived intangible asset amortization periods                 3 years      
Minimum | Building                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 10 years      
Minimum | Machinery and Equipment                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 3 years      
Minimum | Furniture Fixtures And Transportation Equipment                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 3 years      
Minimum | Capitalized Software Development Costs                        
Significant Accounting Policies [Line Items]                        
Estimated useful life, years                 3 years      
Top 10 Customers | Sales Revenue, Net                        
Significant Accounting Policies [Line Items]                        
Percentage of sales                 43.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementBusinessSegmentsAxis
= flo_TopTenCustomersMember		 44.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementBusinessSegmentsAxis
= flo_TopTenCustomersMember		 45.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_StatementBusinessSegmentsAxis
= flo_TopTenCustomersMember