Performance Contingent TSR Shares (Detail) - Total Shareholders Return - EPIP (2014) and Omnibus Plan (2015) - $ / shares shares in Thousands	12 Months Ended
Jan. 02, 2016	Jan. 03, 2015
Grant Date Fourth January Twenty Sixteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	401
Assumed vesting date	Feb. 21, 2018
Fair value per share	$ 24.17
Grant Date Fourth January Twenty Fifteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		414
Assumed vesting date		Feb. 23, 2017
Fair value per share		$ 21.21

Share based compensation arrangement by share based payment award vesting date.

No definition available.

Name:	flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingDate
Namespace Prefix:	flo_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
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_AwardDateAxis=flo_TwentySixteenPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis=flo_ShareholdersReturnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=flo_EquityAndPerformanceIncentivePlanTwoThousandAndFourteenAndOmnibusTwoThousandAndFifteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=flo_GrantDateFourthJanuaryTwentyFifteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: