XML 51 R38.htm IDEA: XBRL DOCUMENT v3.5.0.1
Preferred and Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award        
Shares issued of preferred stock 0 0    
Options outstanding 291,200      
Aggregate intrinsic value of outstanding options $ 21,707      
Aggregate intrinsic value of exercised options $ 8,071      
Exercise price range floor (in Dollars per share) $ 24.11      
Exercise price range ceiling (in Dollars per share) $ 44.39      
Share-based compensation expense $ 7,413 $ 7,307 $ 5,600  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Reduction in available shares per stock option issued 1      
Options outstanding 291,200 401,800 712,024 854,809
Weighted average remaining contractual life (years) 4 years 3 months 26 days      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Reduction in available shares per restricted stock or restricted stock unit issued 2      
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Reduction in available shares per restricted stock or restricted stock unit issued 2      
2009 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares available for grant under the Plan 3,556,936      
Unrecognized compensation costs $ 9,212      
Preferred Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Authorized shares of preferred stock 1,000,000      
Shares issued of preferred stock 0      
Series A Preferred Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Authorized shares of preferred stock 250,000      
Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Authorized shares of common stock 120,000,000