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Schedule of Fair Value of Notes (Parenthetical) (Detail)	12 Months Ended
	Dec. 29, 2018
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

Name:	flo_DebtInstrumentMaturityDateYear
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: