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Summary of Company's Stock Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
4 Months Ended
Apr. 25, 2015
Apr. 19, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock based compensation $ 7,289us-gaap_AllocatedShareBasedCompensationExpense $ 5,483us-gaap_AllocatedShareBasedCompensationExpense
Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock based compensation   197us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Performance Contingent Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock based compensation 6,556us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= flo_PerformanceContingentRestrictedStockMember
4,757us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= flo_PerformanceContingentRestrictedStockMember
Deferred and restricted stock    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock based compensation 642us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= flo_RestrictedAndDeferredStockMember
662us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= flo_RestrictedAndDeferredStockMember
Stock Appreciation Rights    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock based compensation $ 91us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= flo_StockAppreciationRightsMember
$ (133)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= flo_StockAppreciationRightsMember