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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
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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 | $ 877,333,000 us-gaap_SalesRevenueGoodsNet | $ 844,932,000 us-gaap_SalesRevenueGoodsNet | $ 872,791,000 us-gaap_SalesRevenueGoodsNet | $ 839,989,000 us-gaap_SalesRevenueGoodsNet | $ 874,129,000 us-gaap_SalesRevenueGoodsNet | $ 893,576,000 us-gaap_SalesRevenueGoodsNet | $ 1,153,917,000 us-gaap_SalesRevenueGoodsNet | $ 1,124,922,000 us-gaap_SalesRevenueGoodsNet | $ 3,748,973,000 us-gaap_SalesRevenueGoodsNet | $ 3,732,616,000 us-gaap_SalesRevenueGoodsNet | $ 3,031,124,000 us-gaap_SalesRevenueGoodsNet |
Inventory | 93,100,000 us-gaap_InventoryNet |  |  | 100,851,000 us-gaap_InventoryNet |  |  |  |  | 93,100,000 us-gaap_InventoryNet | 100,851,000 us-gaap_InventoryNet |  |
Deferred gain on sale of assets held for sale | 25,700,000 us-gaap_DeferredGainOnSaleOfProperty |  |  | 22,400,000 us-gaap_DeferredGainOnSaleOfProperty |  |  |  |  | 25,700,000 us-gaap_DeferredGainOnSaleOfProperty | 22,400,000 us-gaap_DeferredGainOnSaleOfProperty |  |
Net gain on sale of territories |  |  |  |  |  |  |  |  | 3,800,000 us-gaap_GainLossOnDispositionOfIntangibleAssets | 5,500,000 us-gaap_GainLossOnDispositionOfIntangibleAssets | 2,600,000 us-gaap_GainLossOnDispositionOfIntangibleAssets |
Shipping costs |  |  |  |  |  |  |  |  | 847,600,000 us-gaap_ShippingHandlingAndTransportationCosts | 797,400,000 us-gaap_ShippingHandlingAndTransportationCosts | 675,600,000 us-gaap_ShippingHandlingAndTransportationCosts |
Equipment held under capital leases | 28,900,000 us-gaap_CapitalLeasedAssetsGross |  |  | 22,500,000 us-gaap_CapitalLeasedAssetsGross |  |  |  |  | 28,900,000 us-gaap_CapitalLeasedAssetsGross | 22,500,000 us-gaap_CapitalLeasedAssetsGross |  |
Total accumulated depreciation for assets held under capital leases | 6,300,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation |  |  | 7,000,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation |  |  |  |  | 6,300,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation | 7,000,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation |  |
Depreciation expense |  |  |  |  |  |  |  |  | 117,200,000 us-gaap_Depreciation | 106,700,000 us-gaap_Depreciation | 93,400,000 us-gaap_Depreciation |
Impairment of long-lived assets held and used |  |  |  |  |  |  |  |  | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |
Impairment of Intangible Assets excluding goodwill |  |  |  |  |  |  |  |  | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill |
Goodwill impairment loss |  |  | 2,600,000 us-gaap_GoodwillImpairmentLoss |  |  |  |  |  | 2,624,000 us-gaap_GoodwillImpairmentLoss |  |  |
Advertising and marketing costs |  |  |  |  |  |  |  |  | 22,900,000 us-gaap_MarketingAndAdvertisingExpense | 28,100,000 us-gaap_MarketingAndAdvertisingExpense | 19,100,000 us-gaap_MarketingAndAdvertisingExpense |
Amortization expense of capitalized software development costs |  |  |  |  |  |  |  |  | 2,400,000 us-gaap_CapitalizedComputerSoftwareAmortization | 3,200,000 us-gaap_CapitalizedComputerSoftwareAmortization | 1,600,000 us-gaap_CapitalizedComputerSoftwareAmortization |
Capitalized software development costs | 13,000,000 us-gaap_CapitalizedComputerSoftwareGross |  |  | 14,800,000 us-gaap_CapitalizedComputerSoftwareGross |  |  |  |  | 13,000,000 us-gaap_CapitalizedComputerSoftwareGross | 14,800,000 us-gaap_CapitalizedComputerSoftwareGross |  |
Plan asset amortization conditional percentage |  |  |  |  |  |  |  |  | 10.00%flo_PercentageOfUnrecognizedGainLossOnPensionPlanAssetsFairValueAmortization |  |  |
Pay By Scan |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,206,600,000 us-gaap_SalesRevenueGoodsNet / us-gaap_TypeOfArrangementAxis = flo_PayByScanMember | 1,116,400,000 us-gaap_SalesRevenueGoodsNet / us-gaap_TypeOfArrangementAxis = flo_PayByScanMember | 863,400,000 us-gaap_SalesRevenueGoodsNet / us-gaap_TypeOfArrangementAxis = flo_PayByScanMember |
Inventory | 6,100,000 us-gaap_InventoryNet / us-gaap_TypeOfArrangementAxis = flo_PayByScanMember |  |  | 6,400,000 us-gaap_InventoryNet / us-gaap_TypeOfArrangementAxis = flo_PayByScanMember |  |  |  |  | 6,100,000 us-gaap_InventoryNet / us-gaap_TypeOfArrangementAxis = flo_PayByScanMember | 6,400,000 us-gaap_InventoryNet / us-gaap_TypeOfArrangementAxis = flo_PayByScanMember |  |
Senior Notes Issued |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 us-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 |  |  |  |  |  |  |  |  | $ 5,000 flo_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 |

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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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