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

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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

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