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Assets Held for Sale - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Oct. 07, 2023 | Oct. 07, 2023
Long Lived Assets Held For Sale [Line Items] |  |
Impairment charge |  | $ 1.0
Proceeds from sale of impaired warehouse | $ 1.3 |
Warehouse Classified as Held for Sale |  |
Long Lived Assets Held For Sale [Line Items] |  |
Impairment charge | $ 1.0 |

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- Definition Proceeds from sale of assets held for sale. + References No definition available. + Details
Name: | flo_ProceedsFromSaleOfAssetsHeldForSale
Namespace Prefix: | flo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition For the asset that is reclassified back to held and used from held-for-sale, the amount of impairment charge that is recognized on the reclassification date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 44 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482190/360-10-35-44 + Details
Name: | us-gaap_ImpairmentChargeOnReclassifiedAssets
Namespace Prefix: | us-gaap_
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_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=flo_WarehouseClassifiedAsHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |