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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Apr. 28, 2012
Number of Shares        
Beginning Balance 1,039 3,376 3,860  
Granted 0 0 515  
Exercised (83) (66) (279)  
Forfeited (501) (2,272) (720)  
Ending Balance 455 1,039 3,376 3,860
Vested and expected to vest in the future at end of period 438      
Exercisable at end of period 196      
Available for grant at end of period 4,327      
Weighted Average Exercise Price        
Beginning Balance $ 20.14 $ 17.91 $ 18.76  
Granted 0.00 0.00 11.64  
Exercised 15.47 15.71 12.20  
Forfeited 24.12 16.95 20.19  
Ending Balance 16.62 $ 20.14 $ 17.91 $ 18.76
Vested and expected to vest in the future at end of period 16.69      
Exercisable at end of period $ 18.14      
Weighted Average Remaining Contractual Term        
Weighted Average Remaining Contractual Term 6 years 3 months 7 days 4 years 6 months 11 days 6 years 2 months 27 days 5 years 8 months 12 days
Vested and expected to vest in the future at end of period 6 years 3 months      
Exercisable at end of period 5 years 10 months 10 days      
Aggregate Intrinsic Value        
Aggregate Intrinsic Value $ 3,114 $ 725 $ 7,331 $ 574
Vested and expected to vest in the future at end of period 2,984      
Exercisable at end of period $ 1,245