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EQUITY Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Apr. 28, 2013
Apr. 29, 2012
May 01, 2011
Incentive Compensation Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 12,583,397    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 7,140,603    
Incentive Compensation Plan [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 4.9 $ 6.1 $ 3.8
Income tax benefit from stock-based compensation expense 1.8 2.4 1.5
Capitalized amount of stock-based compensation expense 0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 8.92 $ 9.36 $ 6.61
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 2.4 0.9 0.4
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options 2.9    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 4 months    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 7.5 5.7 1.9
Incentive Compensation Plan [Member] | Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 8.1 8.3 7.5
Income tax benefit from stock-based compensation expense 3.0 3.2 2.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 10.9 15.2  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 21.03 $ 20.63 $ 17.57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (564,433)    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options 6.8    
Executive Officer [Member] | Incentive Compensation Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Arrangement with Individual, Compensation Expense 3.5 4.9  
Deferred Compensation Arrangement with Individual, Estimated Future Compensation Costs $ 5.0    
Deferred Compensation Arrangement with Individual, Estimated Future Compensation Costs, Period of Recognition 1 year 10 months    
Subsequent Event [Member] | Shuanghui Merger [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Merger Agreement, Per Share Price of Company's Common Stock $ 34.00