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Stock-Based Compensation (Stock Appreciation Rights) - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other long-term liabilities	$ 53,695us-gaap_OtherLiabilitiesNoncurrent	$ 51,199us-gaap_OtherLiabilitiesNoncurrent
Stock issued during period, value, stock options exercised	21,014us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	13,685us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	13,881us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Exercisable period	9 years
Other long-term liabilities	300us-gaap_OtherLiabilitiesNoncurrent / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember	2,000us-gaap_OtherLiabilitiesNoncurrent / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember
Stock issued during period, value, stock options exercised	$ 1,400us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember
Share-based compensation arrangement by share-based payment award, options, exercises in period	112,215us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember
Dividend yield	2.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember
Expected volatility	22.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember
Risk-free interest	0.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember
Stock Appreciation Rights | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of rights	$ 10.61flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValue / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Expected life	6 months
Stock Appreciation Rights | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of rights	$ 10.97flo_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValue / us-gaap_AwardTypeAxis = flo_StockAppreciationRightsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Expected life	8 months 12 days

X

- Definition

Provides the fair value at the reporting date of the SAR awards.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Maximum Exercisable Period for Stock Options

+ References

No definition available.

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- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Paragraph 2

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Section D

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

Number of share options (or share units) exercised during the current period.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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Value of stock issued as a result of the exercise of stock options.

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