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Preferred and Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 19, 2014
Jun. 06, 2014
Sep. 13, 2013
Jun. 19, 2013
Jun. 19, 2013
Jun. 07, 2013
Sep. 14, 2012
Jun. 08, 2012
Sep. 16, 2011
Jun. 23, 2011
Jun. 10, 2011
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award                              
Shares issued of preferred stock                       0 0    
Options outstanding                       401,800      
Aggregate intrinsic value of outstanding options                       $ 18,334      
Aggregate intrinsic value of exercised options                       $ 13,382      
Number of shares vested during period                       441,000      
Share-based compensation expense                       $ 7,307 $ 5,600 $ 4,270  
Exercise price range floor                       $ 20.68      
Exercise price range ceiling                       $ 44.39      
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      
Restricted stock and restricted stock units granted in period                       91,000 91,650 46,998  
Restricted Stock Units | Certain Employees                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Restricted stock and restricted stock units granted in period               32,998     9,198        
Fair value of restricted stock units granted in period               $ 59.48     $ 40.49        
Restricted Stock Units | Certain Officers and Key Employees                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Restricted stock and restricted stock units granted in period   91,000   1,500 77,650 76,150                  
Fair value of awards   $ 6,584                          
Fair value of restricted stock units granted in period       $ 60.47   $ 62.26                  
Restricted Stock Units | Chief Executive Officer                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Restricted stock and restricted stock units granted in period                   15,000          
Fair value of restricted stock units granted in period                   $ 44.39          
Restricted Stock Units | Non-Employee Members of the Board                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Restricted stock and restricted stock units granted in period     14,000       14,000   14,000            
Fair value of restricted stock units granted in period     $ 71.02       $ 58.93   $ 47.59            
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 | Certain Officers and Key Employees                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Restricted stock and restricted stock units granted in period   30,538                          
Fair value of awards   $ 2,209                          
Restricted Stock | Non-Employee Members of the Board                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Restricted stock and restricted stock units granted in period 13,955                            
Fair value of awards $ 990                            
Stock Options                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Reduction in available shares per stock option issued                       1      
Options outstanding                       401,800 712,024 854,809 1,053,509
Options granted in period                       0 0 0  
Weighted average remaining contractual life (years)                       5 years 1 month 17 days      
Stock Options | Certain Officers and Key Employees                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Options granted in period                   441,000          
2009 Stock Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award                              
Shares available for grant under the Plan                       3,894,908      
Unrecognized compensation costs                       $ 5,714      
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