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Shareholders' Equity and Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Stock Options      
Outstanding at beginning of year, Shares 2,935    
Granted, Shares 205    
Canceled or forfeited, Shares (167)    
Exercised, Shares (232)    
Outstanding at end of year, Shares 2,741 2,935  
Shares vested and expected to vest 2,714    
Exercisable at end of year, Shares 2,018    
Weighted Average Exercise Price Per Share      
Outstanding at beginning of year, (usd per share) $ 13.77    
Granted, (usd per share) 13.31    
Canceled or forfeited, (usd per share) 14.57    
Exercised, (usd per share) 10.84    
Outstanding at end of year, (usd per share) 13.94 $ 13.77  
Shares vested and expected to vest (usd per share) 13.96    
Exercisable at end of year (usd per share) $ 14.96    
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 4 years 7 months 17 days 5 years  
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2 4 years 7 months 17 days 5 years  
Vested and expected to vest, weighted average remaining contractual life 4 years 7 months 6 days    
Exercisable at end of period, weighted average remaining contractual life 3 years 6 months 15 days    
Outstanding, beginning of period, aggregate intrinsic value $ 6,333    
Exercised, aggregate intrinsic value 533 $ 1,534 $ 562
Outstanding, end of period, aggregate intrinsic value 2,258 $ 6,333  
Shares vested and expected to vest, aggregate intrinsic value 2,244    
Exercisable at end of period, aggregate intrinsic value $ 1,802