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Leases - Additional Information (Detail) - USD ($) | 4 Months Ended
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Apr. 18, 2020 | Apr. 20, 2019
Leases [Abstract] |  |
Increase in lease assets and liabilities, net | $ 2,500,000 | $ 1,300,000
Additional impairment charge recognized | $ 100,000 | $ 0

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- Definition Operating lease modifications. + References No definition available. + Details
Name: | flo_OperatingLeaseModifications
Namespace Prefix: | flo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888369&loc=SL77918431-209957 + Details
Name: | us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration