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Leases - Additional Information (Detail) $ in Millions | 12 Months Ended
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Jan. 01, 2022 USD ($) Warehouse | Jan. 02, 2021 USD ($) Warehouse
Leases [Abstract] |  |
Number of leased warehouses purchased | Warehouse | 27 |
Purchase of leased warehouses | $ | $ 64.7 |
Number of purchased properties impaired | Warehouse |  | 2
Number of remaining lease | Warehouse | 25 |
Gain on purchase of lease | $ |  | $ 2.6
Carrying values for remaining lease | $ | $ 35.4 |

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- Definition Carrying values for remaining leases. + References No definition available. + Details
Name: | flo_CarryingValuesForRemainingLeases
Namespace Prefix: | flo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain on purchase of lease. + References No definition available. + Details
Name: | flo_GainOnPurchaseOfLease
Namespace Prefix: | flo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of leased warehouses purchased. + References No definition available. + Details
Name: | flo_NumberOfLeasedWarehousesPurchased
Namespace Prefix: | flo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of purchased properties impaired. + References No definition available. + Details
Name: | flo_NumberOfPurchasedPropertiesImpaired
Namespace Prefix: | flo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of remaining lease. + References No definition available. + Details
Name: | flo_NumberOfRemainingLease
Namespace Prefix: | flo_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 The cash outflow for acquisition of buildings (properties) whether for investment or use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBuildings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration