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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
Apr. 30, 2016
May 02, 2015
Apr. 26, 2014
Stock Options      
Outstanding at beginning of year, Shares 2,741    
Granted, Shares 240    
Canceled or forfeited, Shares (309)    
Exercised, Shares (66)    
Outstanding at end of year, Shares 2,606 2,741  
Shares vested and expected to vest 2,581    
Exercisable at end of year, Shares 1,920    
Weighted Average Exercise Price Per Share      
Outstanding at beginning of year, (usd per share) $ 13.94    
Granted, (usd per share) 8.51    
Canceled or forfeited, (usd per share) 14.42    
Exercised, (usd per share) 9.26    
Outstanding at end of year, (usd per share) 13.50 $ 13.94  
Shares vested and expected to vest (usd per share) 13.53    
Exercisable at end of year (usd per share) $ 14.70    
Outstanding, beginning of period, weighted average remaining contractual life 4 years 6 months 26 days 4 years 7 months 17 days  
Outstanding, end of period, weighted average remaining contractual life 4 years 6 months 26 days 4 years 7 months 17 days  
Vested and expected to vest, weighted average remaining contractual life 4 years 6 months 15 days    
Exercisable at end of period, weighted average remaining contractual life 3 years 6 months    
Outstanding, beginning of period, aggregate intrinsic value $ 2,258    
Exercised, aggregate intrinsic value 132 $ 533 $ 1,534
Outstanding, end of period, aggregate intrinsic value 158 $ 2,258  
Shares vested and expected to vest, aggregate intrinsic value 156    
Exercisable at end of period, aggregate intrinsic value $ 113