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Fair Value of Financial Instruments - Additional Information (Detail) - Distributor	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Fair Value Disclosures [Line Items]
Number of independent distributors	4,200	4,300
Maximum
Fair Value Disclosures [Line Items]
Financing period of distribution rights, years	10 years

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

- Definition

Represents the term in years for distributor notes receivable

+ References

No definition available.

+ Details

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Namespace Prefix:	flo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the approximate number of independent distributors for the company.

+ References

No definition available.

+ Details

Name:	flo_NumberOfIndependentDistributors
Namespace Prefix:	flo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: