Plan Asset and Target Asset Allocations (Detail) - Plan No. 2	Dec. 30, 2023	Dec. 31, 2022
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Percentage of Plan Assets at the Measurement Date	100.00%	100.00%
Equity Securities
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2024	23.00%
Percentage of Plan Assets at the Measurement Date	23.00%	28.00%
Fixed Income Securities
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2024	75.00%
Percentage of Plan Assets at the Measurement Date	75.00%	70.00%
Short Term Investments And Cash
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items]
Target Allocation 2024	2.00%
Percentage of Plan Assets at the Measurement Date	2.00%	2.00%

Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]

No definition available.

Name:	flo_ScheduleOfDefinedBenefitPlanAssetAllocationTargetsLineItems
Namespace Prefix:	flo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RetirementPlanTypeAxis=flo_PlanTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=flo_ShortTermInvestmentsAndCashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: