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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. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Stock Options      
Outstanding at beginning of year, Shares 2,481    
Granted, Shares 169    
Canceled or forfeited, Shares (287)    
Exercised, Shares (58)    
Outstanding at end of year, Shares 2,305 2,481  
Shares vested and expected to vest 2,282    
Exercisable at end of year, Shares 1,788    
Weighted Average Exercise Price Per Share      
Outstanding at beginning of year, (usd per share) $ 11.15    
Granted, (usd per share) 9.63    
Canceled or forfeited, (usd per share) 19.78    
Exercised, (usd per share) 8.91    
Outstanding at end of year, (usd per share) 10.02 $ 11.15  
Shares vested and expected to vest (usd per share) 10.02    
Exercisable at end of year (usd per share) $ 10.04    
Outstanding, beginning of period, weighted average remaining contractual life 4 years 6 months 2 days 4 years 6 months 11 days  
Outstanding, end of period, weighted average remaining contractual life 4 years 6 months 2 days 4 years 6 months 11 days  
Vested and expected to vest, weighted average remaining contractual life 4 years 5 months 18 days    
Exercisable at end of period, weighted average remaining contractual life 3 years 6 months    
Outstanding, beginning of period, aggregate intrinsic value $ 768    
Exercised, aggregate intrinsic value 65 $ 64 $ 132
Outstanding, end of period, aggregate intrinsic value 356 $ 768  
Shares vested and expected to vest, aggregate intrinsic value 354    
Exercisable at end of period, aggregate intrinsic value $ 304