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Company Contributions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Expected company contribution | $ 691 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear |  |
Net Periodic Pension Cost |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Contribution of company to company pension plans | 13,435 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember | 15,254 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember | 18,579 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember
401K (DC Plan) |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Contribution of company to company pension plans | 478 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_FourHundredOneKPlanMember | 900 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_FourHundredOneKPlanMember | 958 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_FourHundredOneKPlanMember
Required | Net Periodic Pension Cost |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Contribution of company to company pension plans | 5,070 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember / us-gaap_DefinedContributionPlanTypeAxis = flo_RequiredMember | 5,416 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember / us-gaap_DefinedContributionPlanTypeAxis = flo_RequiredMember | 9,430 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember / us-gaap_DefinedContributionPlanTypeAxis = flo_RequiredMember
Discretionary |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Contribution of company to company pension plans | 8,400 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = flo_DiscretionaryMember |  |
Discretionary | Net Periodic Pension Cost |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Contribution of company to company pension plans | $ 8,365 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember / us-gaap_DefinedContributionPlanTypeAxis = flo_DiscretionaryMember | $ 9,838 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember / us-gaap_DefinedContributionPlanTypeAxis = flo_DiscretionaryMember | $ 9,149 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = flo_NetPeriodicPensionCostMember / us-gaap_DefinedContributionPlanTypeAxis = flo_DiscretionaryMember

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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