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Lease Modifications and Renewals and Lease Impairments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Jan. 01, 2022
Leases [Abstract] |  |
Lease modifications and renewals | $ 28,278 | $ 46,790
Lease terminations | $ 6,035 | $ 41,610

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

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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 40 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123386189&loc=SL77918607-209975 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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