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Disclosure of Compensation Related Costs, Share Based Payments (Details) - 2009 Stock Incentive Plan - USD ($)
$ in Thousands
3 Months Ended
Jun. 05, 2015
Sep. 19, 2014
Jun. 06, 2014
Sep. 13, 2013
Jun. 19, 2013
Jun. 07, 2013
Jul. 31, 2015
Jul. 31, 2014
Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award                  
Number of shares available for grant             3,588,682    
Restricted Stock Units (RSUs)                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Grants in period (in shares)             104,200    
Allocated share-based compensation expense               $ 1,632  
Unrecognized compensation costs related to Plan             $ 13,112    
Employee Stock Option                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Aggregate intrinsic value for outstanding options             $ 23,129    
Weighted average remaining contractual life (in years)             4 years 10 months 15 days    
Aggregate intrinsic value for exercised options             $ 2,926    
Allocated share-based compensation expense             1,737    
Unrecognized compensation costs related to Plan             $ 0    
Number of options outstanding             352,300   401,800
Certain Officers and Key Employees | Restricted Stock Units (RSUs)                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Grants in period (in shares) 104,200   91,000   77,650 77,650      
Fair value of awards during period $ 9,135   $ 6,584   $ 4,816 $ 4,816      
Certain Officers and Key Employees | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Grants in period (in shares) 48,913   30,538            
Fair value of awards during period $ 4,288   $ 2,209            
Non-Employee Members of the Board | Restricted Stock Units (RSUs)                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Grants in period (in shares)       14,000          
Fair value of awards during period       $ 958          
Non-Employee Members of the Board | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award                  
Grants in period (in shares)   13,955              
Fair value of awards during period   $ 990