Vesting Time-Based Restricted Stock Units (Detail) - USD ($) $ in Thousands	4 Months Ended
Apr. 23, 2022	Apr. 24, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends at Vesting	$ 2,220	$ 163
Fiscal Year Vested 2022 \| 2020 Award Granted
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends at Vesting	106
Income tax benefit/(expense) related to share-based payments	100
Fair Value at Vesting	1,818
Fiscal Year Vested 2022 \| 2019 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends at Vesting	67
Income tax benefit/(expense) related to share-based payments	161
Fair Value at Vesting	1,870
Fiscal Year Vested 2022 \| 2021 Award Granted
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends at Vesting	159
Income tax benefit/(expense) related to share-based payments	106
Fair Value at Vesting	$ 2,262

Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

No definition available.

+ Details

Name:	us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind dividends declared for award under share-based payment arrangement.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

- Details

Name:	us-gaap_VestingAxis=flo_ShareBasedCompensationAwardTrancheSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=flo_TwentyTwentyAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=flo_TwentyNineteenAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=flo_TwentyTwentyOneAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: