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Lease Modifications and Renewals and Lease Terminations (Detail) - USD ($) $ in Thousands | 4 Months Ended
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Apr. 19, 2025 | Apr. 20, 2024
Leases [Abstract] |  |
Lease modifications and renewals | $ 6,980 | $ 16,465
Lease terminations | $ 55 | $ 1,331

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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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479092/842-20-40-1 + 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