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Fair Value of Financial Instruments - Additional Information (Detail) - Distributor | 12 Months Ended
--- | ---
Dec. 29, 2018 | Dec. 30, 2017
Fair Value Disclosures [Line Items] |  |
Number of independent distributors | 4,300 | 4,000
Maximum |  |
Fair Value Disclosures [Line Items] |  |
Financing period of distribution rights, years | 10 years |

X
- Definition Fair value disclosures. + References No definition available. + Details
Name: | flo_FairValueDisclosuresLineItems
Namespace Prefix: | flo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the term in years for distributor notes receivable + References No definition available. + Details
Name: | flo_FinancingPeriodOfDistributorNotesReceivable
Namespace Prefix: | flo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the approximate number of independent distributors for the company. + References No definition available. + Details
Name: | flo_NumberOfIndependentDistributors
Namespace Prefix: | flo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |