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Summary of Total Cost and Employer Contributions (Detail) - USD ($) $ in Thousands | 4 Months Ended
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Apr. 24, 2021 | Apr. 18, 2020
Compensation And Retirement Disclosure [Abstract] |  |
Defined Contribution Plan, Plan Name [Extensible List] | flo:FourZeroOneKRetirementSavingsPlanMember | flo:FourZeroOneKRetirementSavingsPlanMember
Total cost and employer contributions | $ 9,136 | $ 8,629

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