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Schedule of Fair Value of Notes (Parenthetical) (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 07, 2017 | Dec. 31, 2016
2026 Notes |  |
Fair Value Disclosures [Line Items] |  |
Senior notes due year | 2026 | 2026
2022 Notes |  |
Fair Value Disclosures [Line Items] |  |
Senior notes due year | 2022 | 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
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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: |