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Preferred and Common Stock (Details) - USD ($)
2 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
Jul. 31, 2016
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award            
Shares issued of preferred stock (shares) 0   0 0    
Options outstanding (shares) 222,050   222,050      
Aggregate intrinsic value of outstanding options $ 16,335,000   $ 16,335,000      
Aggregate intrinsic value of exercised options     $ 6,137,000      
Exercise price range floor (in Dollars per share)     $ 25.26      
Exercise price range ceiling (in Dollars per share)     $ 44.39      
Share-based compensation expense     $ 10,697,000 $ 7,413,000 $ 7,307,000  
Net cash used in financing activities     (3,606,000) (50,184,000) (22,602,000)  
Net cash provided by operating activities     459,273,000 472,386,000 348,645,000  
Income tax benefit from share-based compensation   $ 3,046,000        
Share repurchase program authorized amount $ 300,000,000   $ 300,000,000      
Share repurchase program period in force     2 years      
Common stock shares repurchased (shares) 443,800   443,800      
Repurchase of common stock $ 49,400,000   $ 49,374,000      
Remaining authorized repurchase amount $ 250,600,000   $ 250,600,000      
Accounting Standards Update 2016-09            
Share-based Compensation Arrangement by Share-based Payment Award            
Net cash used in financing activities       $ 4,975,000    
Net cash provided by operating activities         $ 3,339,000  
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award            
Reduction in available shares per stock option issued (shares) 1   1      
Options outstanding (shares) 222,050   222,050 291,200 401,800 712,024
Weighted average remaining contractual life (years)     3 years 5 months 27 days      
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award            
Reduction in available shares per restricted stock or restricted stock unit issued (shares) 2   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 (shares) 2   2      
2009 Stock Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Shares available for grant under the Plan (shares) 3,250,062   3,250,062      
Unrecognized compensation costs $ 12,693,000   $ 12,693,000      
Preferred Stock            
Share-based Compensation Arrangement by Share-based Payment Award            
Authorized shares of preferred stock (shares) 1,000,000   1,000,000      
Shares issued of preferred stock (shares) 0   0      
Series A Preferred Stock            
Share-based Compensation Arrangement by Share-based Payment Award            
Authorized shares of preferred stock (shares) 250,000   250,000      
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award            
Authorized shares of common stock (shares) 120,000,000   120,000,000