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Long Term Debt and Capital Leases (Net of Issuance Costs and Debt Discounts Excluding Line-of-credit Arrangements) (Parenthetical) (Detail)	9 Months Ended	12 Months Ended
	Oct. 07, 2017	Dec. 31, 2016
2026 Notes
Debt Instrument [Line Items]
Senior notes due year	2026	2026
2022 Notes
Debt Instrument [Line Items]
Senior notes due year	2022	2022

X

- Definition

Debt instrument maturity date year.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- 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

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Namespace Prefix:	us-gaap_
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
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Balance Type:
Period Type: