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Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions	Jan. 02, 2021	Dec. 28, 2019
VIE
Variable Interest Entity [Line Items]
Gross distribution rights notes receivable	$ 171.1	$ 183.2

X

- Definition

Distribution rights notes receivable gross.

+ References

No definition available.

+ Details

Name:	flo_DistributionRightsNotesReceivableGross
Namespace Prefix:	flo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: