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Shareholders' Equity and Share-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Stock Options      
Outstanding at beginning of year, Shares 3,290    
Granted, Shares 485    
Canceled or forfeited, Shares (157)    
Exercised, Shares (197)    
Outstanding at end of year, Shares 3,421 3,290  
Shares vested and expected to vest 3,377    
Exercisable at end of year, Shares 2,301    
Weighted Average Exercise Price Per Share      
Outstanding at beginning of year, (usd per share) $ 13.73    
Granted, (usd per share) $ 9.51    
Canceled or forfeited, (usd per share) $ 12.55    
Exercised, (usd per share) $ 6.69    
Outstanding at end of year, (usd per share) $ 13.59 $ 13.73  
Shares vested and expected to vest (usd per share) $ 13.63    
Exercisable at end of year (usd per share) $ 15.42    
Outstanding, beginning of period, weighted average remaining contractual life 5 years 1 month 2 days 5 years 4 months 2 days  
Outstanding, end of period, weighted average remaining contractual life 5 years 1 month 2 days 5 years 4 months 2 days  
Vested and expected to vest, weighted average remaining contractual life 5 years 18 days    
Exercisable at end of period, weighted average remaining contractual life 3 years 8 months 16 days    
Outstanding, beginning of period, aggregate intrinsic value $ 463    
Exercised, aggregate intrinsic value 562 624 1,945
Outstanding, end of period, aggregate intrinsic value 1,176 463  
Shares vested and expected to vest, aggregate intrinsic value 1,166    
Exercisable at end of period, aggregate intrinsic value $ 828