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Summary of Total Cost and Employer Contributions (Detail) - USD ($) $ in Thousands | 4 Months Ended
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Apr. 23, 2022 | Apr. 24, 2021
Compensation And Retirement Disclosure [Abstract] |  |
Defined contribution plan, plan name description | 401(k) Retirement Savings Plan |
Total cost and employer contributions | $ 9,406 | $ 9,136

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- Definition Defined contribution plan plan name description. + References No definition available. + Details
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Namespace Prefix: | flo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
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