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Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions | Apr. 18, 2020 | Dec. 28, 2019
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VIE |  |
Variable Interest Entity [Line Items] |  |
Gross distribution rights notes receivable | $ 181.6 | $ 183.2

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- Definition Distribution rights notes receivable gross. + References No definition available. + Details
Name: | flo_DistributionRightsNotesReceivableGross
Namespace Prefix: | flo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |