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Schedule of Identified Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Feb. 23, 2013 | Oct. 05, 2013 | Jul. 19, 2013 | Jul. 21, 2012 | Aug. 17, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  | $ 415,813 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 318,476 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |
Contingently refundable consideration (the "holdback") |  |  |  | (10,000)us-gaap_BusinessCombinationContingentConsiderationLiability |  |  |  |
Flowers Foods, Inc. common stock | 45,887 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable |  |  |  |  |  |  |
Goodwill | 282,960 us-gaap_Goodwill | 282,404 us-gaap_Goodwill | 269,897 us-gaap_Goodwill |  |  |  |  |
Bargain purchase gain |  | 50,071 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |  |  |  |
Sara Lee and Earthgrains acquisition of trademark licenses |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration transferred |  |  |  | 49,950 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember |  |  |  |
Contingently refundable consideration (the "holdback") |  |  |  | (7,600)us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember |  |  |  | (7,600)us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember
Total consideration, net |  |  |  | 42,350 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember |  |  |  |
Property, plant, and equipment |  |  |  | 6,476 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember |  |  |  |
Deferred income taxes, net |  |  |  | (31,345)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember | (800)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember |  |  |
Net recognized amounts of identifiable assets acquired |  |  |  | 92,421 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember |  |  |  |
Bargain purchase gain |  |  |  | 50,071 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember | 1,200 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember |  |  |
Sara Lee and Earthgrains acquisition of trademark licenses | Distribution Rights |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 25,790 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DistributionRightsMember |  |  |  |
Sara Lee and Earthgrains acquisition of trademark licenses | Trademarks |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 79,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  |
Sara Lee and Earthgrains acquisition of trademark licenses | Customer Relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 12,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = flo_SaraLeeAndEarthgrainsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |
Acquired Hostess Bread Asset |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration transferred |  |  |  |  |  | 355,342 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |
Financial assets |  |  |  |  |  | 5,153 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |
Property, plant, and equipment |  |  |  |  |  | 153,990 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |
Net recognized amounts of identifiable assets acquired |  |  |  |  |  | 348,143 flo_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAndGainOnSettlement / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |
Goodwill | 8,599 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember | 5,419 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |  |  | 8,599 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |
Gain on legal settlement |  |  |  |  | (1,400)us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember | (1,400)us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |
Net recognized amounts of identifiable assets acquired |  |  |  |  |  | 346,743 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember |  |
Acquired Hostess Bread Asset | Trademarks |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  | 189,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |
Lepage Bakeries Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | 318,605 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Cash consideration transferred |  |  |  |  |  |  | 318,600 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Deferred payment obligations |  |  |  |  |  |  | 17,663 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Flowers Foods, Inc. common stock |  |  |  |  |  |  | 45,887 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Total consideration, net |  |  |  |  |  |  | 382,155 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Financial assets |  |  |  |  |  |  | 11,658 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Inventories |  |  |  |  |  |  | 4,537 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Property, plant, and equipment |  |  |  |  |  |  | 59,970 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Assets held for sale - Distributor routes |  |  |  |  |  |  | 16,098 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Identifiable intangible assets |  |  |  |  |  |  | 256,400 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Deferred income taxes, net |  |  |  |  |  |  | (1,137)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Financial liabilities |  |  |  |  |  |  | (17,076)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Net recognized amounts of identifiable assets acquired |  |  |  |  |  |  | 330,450 flo_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAndGainOnSettlement / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |
Goodwill |  |  |  |  |  |  | $ 51,705 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |

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