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Stock-Based Compensation (Performance-Contingent Total Shareholder Return Shares) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Jan. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP $ 4.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Expected weighted-average period to recognize compensation cost (years) 1 year    
2012 awards | Total Shareholder Return      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of actual ROI attainment 195.00%flo_PercentageOfActualAverageReturnOnInvestedCapitalOnShareBasedCompensationArrangement
/ us-gaap_AwardTypeAxis
= flo_TwentyTwelvePlanYearMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= flo_TotalShareholderReturnMember
   
Total Shareholders Return      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment award, fair value assumptions, method used Inputs into the model included the following for the company and comparator companies (i) TSR from the beginning of the performance cycle through the measurement date; (ii) volatility; (iii) risk-free interest rates; and (iv) the correlation of the comparator companies' TSR. The inputs are based on historical capital market data.    
Performance Contingent Total Shareholder Return Shares | Performance contingent Awards 2013 and 2014      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   2 years 2 years
Performance Contingent Total Shareholder Return Shares | Performance contingent Awards 2012      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period     18 months