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v3.19.3.a.u2

Schedule of Fair Value of Notes (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 28, 2019
2026 Notes |
Fair Value Disclosures [Line Items] |
Senior notes due year | 2026
2022 Notes |
Fair Value Disclosures [Line Items] |
Senior notes due year | 2022

X
- Definition Debt instrument maturity date year. + References No definition available. + Details
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Namespace Prefix: | flo_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value disclosures. + References No definition available. + Details
Name: | flo_FairValueDisclosuresLineItems
Namespace Prefix: | flo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=flo_ThreePointFivePercentSeniorNotesDueTwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=flo_FourPointThreeSevenFivePercentSeniorNotesDueTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |