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Stock Based Compensation - Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 24, 2016
Apr. 26, 2015
Apr. 27, 2014
Restricted stock units ("RSUs")      
Restricted Stock      
Outstanding at the beginning of the period (in shares)      
Granted (in shares) 104,982    
Outstanding at the end of the period (in shares) 104,982    
Weighted Average Grant-Date Fair Value      
Outstanding at the beginning of the period (in dollars per share)      
Granted (in dollars per share) $ 14.89    
Outstanding at the end of the period (in dollars per share) $ 14.89    
As of the end of the period      
Weighted average remaining contractual term, Restricted Stock 1 year 6 months    
Aggregate intrinsic value:      
Outstanding, Restricted Stock $ 1,572    
Nonvested:      
Unrecognized compensation cost $ 381    
Weighted average remaining vesting period 1 year 6 months    
Restricted Stock      
Restricted Stock      
Outstanding at the beginning of the period (in shares) 325,074    
Granted (in shares) 141,353    
Vested (in shares) (238,669)    
Forfeited and expired (in shares) (7,433)    
Outstanding at the end of the period (in shares) 220,325 325,074  
Weighted Average Grant-Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 7.28    
Granted (in dollars per share) 19.80    
Vested (in dollars per share) 7.88    
Forfeited and expired (in dollars per share) 12.72    
Outstanding at the end of the period (in dollars per share) $ 14.33 $ 7.28  
As of the end of the period      
Weighted average remaining contractual term, Restricted Stock 9 months 18 days    
Aggregate intrinsic value:      
Outstanding, Restricted Stock $ 3,299    
Nonvested:      
Unrecognized compensation cost $ 1,093    
Weighted average remaining vesting period 9 months 18 days    
Stock Options      
Options      
Outstanding at the beginning of the period (in shares) 405,060    
Granted (in shares) 378,905 0 0
Exercised (in shares) (134,000)    
Forfeited and expired (in shares) (39,600)    
Outstanding at the end of the period (in shares) 610,365 405,060  
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 11.18    
Granted (in dollars per share) 14.86    
Exercised (in dollars per share) 6.48    
Forfeited and expired (in dollars per share) 21.35    
Outstanding at the end of the period (in dollars per share) $ 13.84 $ 11.18  
As of the end of the period      
Outstanding exercisable options 610,365    
Outstanding exercisable options, Weighted Average Exercise Price (in dollars per share) $ 13.84    
Weighted average remaining contractual term, Options 4 years 8 months 12 days    
Aggregate intrinsic value:      
Outstanding exercisable $ 1,056    
Outstanding, Options 1,100    
Nonvested:      
Unrecognized compensation cost for unvested stock options $ 743