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Stock-Based Compensation (Performance-Contingent Restricted Stock) - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends paid on vested performance-contingent restricted stock awards	$ 608,000us-gaap_DividendsShareBasedCompensation	$ 386,000us-gaap_DividendsShareBasedCompensation	$ 255,000us-gaap_DividendsShareBasedCompensation
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP	4,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Expected weighted-average period to recognize compensation cost (years)	1 year
Total share holder return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional common shares issued	50,939us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodIncreaseDecrease / us-gaap_AwardTypeAxis = flo_RestrictedStockAwardsMember
Expected weighted-average period to recognize compensation cost (years)	1 year
Performance Contingent Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends paid on vested performance-contingent restricted stock awards	400,000us-gaap_DividendsShareBasedCompensation / us-gaap_AwardTypeAxis = flo_PerformanceContingentRestrictedStockMember
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP	8,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = flo_PerformanceContingentRestrictedStockMember
Total fair value of shares vested	13,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = flo_PerformanceContingentRestrictedStockMember
Tax shortfall on vesting (issuance) of performance-contingent awards	2,700,000us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation / us-gaap_AwardTypeAxis = flo_PerformanceContingentRestrictedStockMember
Performance Contingent Total Shareholder Return Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of change in grant	195.00%flo_PercentageOfChangeInGrantsMaximum / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = flo_TotalShareholderReturnSharesMember
Performance Contingent Total Shareholder Return Shares | Total share holder return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional common shares issued	193,756us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPeriodIncreaseDecrease / us-gaap_AwardTypeAxis = flo_RestrictedStockAwardsMember / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = flo_TotalShareholderReturnSharesMember
Performance Contingent Return On Invested Capital Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of change in grant	125.00%flo_PercentageOfChangeInGrantsMaximum / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = flo_ReturnOnInvestedCapitalSharesMember
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP	$ 4,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = flo_ReturnOnInvestedCapitalSharesMember
Expected weighted-average period to recognize compensation cost (years)	1 year

X

- Definition

Percentage Of Change In Grants Maximum

+ References

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- Definition

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

+ References

No definition available.

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- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

+ 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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- 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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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