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Schedule of Actuarial Gain/(loss) on Defined Benefit Obligations (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019
Compensation And Retirement Disclosure [Abstract] |  |  |
defined benefit plan obligations, interest rate basis points | 30.00% | 60.00% | 90.00%

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- Definition Defined benefit plan obligations, interest rate basis points + References No definition available. + Details
Name: | flo_DefinedBenefitPlanObligationsInterestRateBasisPoints
Namespace Prefix: | flo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration