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Accumulated Other Comprehensive Loss (Income) Related to Derivative Transactions (Detail) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | $ (3,201,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet | $ (24,457,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet | $ (1,546,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Closed or Expiring Over Next Three Years |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 11,400,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember |  |
Closed or Expiring Over Next Three Years | Closed Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI | 1,400,000 us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / flo_DerivativeContractExpirationAxis = flo_ContractsClosedMember |  |
Closed or Expiring Over Next Three Years | Expiring in 2015 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 8,500,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / flo_DerivativeContractExpirationAxis = flo_ExpiringYearOneMember |  |
Closed or Expiring Over Next Three Years | Expiring in 2016 and beyond |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 1,500,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / flo_DerivativeContractExpirationAxis = flo_ExpiringYearThreeMember |  |
Commodity price risk derivatives | Closed or Expiring Over Next Three Years |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 10,300,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember |  |
Commodity price risk derivatives | Closed or Expiring Over Next Three Years | Closed Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI | 300,000 us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / flo_DerivativeContractExpirationAxis = flo_ContractsClosedMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember |  |
Commodity price risk derivatives | Closed or Expiring Over Next Three Years | Expiring in 2015 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 8,500,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / flo_DerivativeContractExpirationAxis = flo_ExpiringYearOneMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember |  |
Commodity price risk derivatives | Closed or Expiring Over Next Three Years | Expiring in 2016 and beyond |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 1,500,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / flo_DerivativeContractExpirationAxis = flo_ExpiringYearThreeMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember |  |
Interest rate risk derivatives | Closed or Expiring Over Next Three Years |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) related to commodity price risk and interest rate risk derivative transactions | 1,100,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
Interest rate risk derivatives | Closed or Expiring Over Next Three Years | Closed Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI | $ 1,100,000 us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred / us-gaap_DerivativeByNatureAxis = flo_ClosedOrExpiringOverNextThreeYearsMember / flo_DerivativeContractExpirationAxis = flo_ContractsClosedMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |

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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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