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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. 29, 2017
Apr. 30, 2016
May 02, 2015
Stock Options      
Outstanding at beginning of year, Shares 2,606    
Granted, Shares 234    
Canceled or forfeited, Shares (320)    
Exercised, Shares (39)    
Outstanding at end of year, Shares 2,481 2,606  
Shares vested and expected to vest 2,458    
Exercisable at end of year, Shares 1,868    
Weighted Average Exercise Price Per Share      
Outstanding at beginning of year, (usd per share) $ 13.50    
Granted, (usd per share) 9.57    
Canceled or forfeited, (usd per share) 29.41    
Exercised, (usd per share) 8.78    
Outstanding at end of year, (usd per share) 11.15 $ 13.50  
Shares vested and expected to vest (usd per share) 11.16    
Exercisable at end of year (usd per share) $ 11.49    
Outstanding, beginning of period, weighted average remaining contractual life 4 years 6 months 11 days 4 years 6 months 26 days  
Outstanding, end of period, weighted average remaining contractual life 4 years 6 months 11 days 4 years 6 months 26 days  
Vested and expected to vest, weighted average remaining contractual life 4 years 6 months    
Exercisable at end of period, weighted average remaining contractual life 3 years 5 months 27 days    
Outstanding, beginning of period, aggregate intrinsic value $ 158    
Exercised, aggregate intrinsic value 64 $ 132 $ 533
Outstanding, end of period, aggregate intrinsic value 768 $ 158  
Shares vested and expected to vest, aggregate intrinsic value 762    
Exercisable at end of period, aggregate intrinsic value $ 635