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Leases - Additional Information (Detail) - USD ($) $ in Thousands | 4 Months Ended
--- | ---
Apr. 22, 2023 | Apr. 23, 2022
Lessee Lease Description [Line Items] |  |
Lease modifications and renewals | $ 17,348 | $ 13,815
Warehouse Leases |  |
Lessee Lease Description [Line Items] |  |
Lease modifications and renewals |  | $ 11,200
Freezer Storage Leases |  |
Lessee Lease Description [Line Items] |  |
Lease modifications and renewals | $ 10,600 |

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=flo_WarehouseLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=flo_FreezerStorageLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |