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Summary of Total Cost and Employer Contributions (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jul. 17, 2021 | Jul. 11, 2020 | Jul. 17, 2021 | Jul. 11, 2020
Compensation And Retirement Disclosure [Abstract] |  |  |  |
Defined Contribution Plan, Plan Name [Extensible List] | flo:FourZeroOneKRetirementSavingsPlanMember | flo:FourZeroOneKRetirementSavingsPlanMember | flo:FourZeroOneKRetirementSavingsPlanMember | flo:FourZeroOneKRetirementSavingsPlanMember
Total cost and employer contributions | $ 6,219 | $ 6,593 | $ 15,355 | $ 15,222

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