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Stock-Based Compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Y
Apr. 30, 2011
Apr. 30, 2012
Class A Nonvoting Common Stock [Member]
Apr. 30, 2012
Performance Based Options [Member]
Apr. 30, 2011
Performance Based Options [Member]
Apr. 30, 2012
Service Based Options [Member]
Apr. 30, 2011
Service Based Options [Member]
Jul. 31, 2008
Performance Based Restricted Shares [Member]
Apr. 30, 2012
Performance Based Restricted Shares [Member]
Jul. 31, 2011
Performance Based Restricted Shares [Member]
Frank M. Jaehnert [Member]
Apr. 30, 2012
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expiration period of options           10 years   10 years          
Vesting period of service based stock options         Generally vest ratably over a three-year period, with one-third becoming exercisable one year after the grant date and one-third additional in each of the succeeding two years               after a seven-year period
Outstanding stock options and restricted shares of Class A Nonvoting Common Stock         6,776,947                
Future issuance of stock option and restricted shares         4,950,950                
Weighted average exercise price           $ 29.55 $ 28.35 $ 27.05 $ 29.10 $ 32.83   $ 28.35  
Weighted-average fair value of options granted during the period           $ 10.01 $ 9.87 $ 8.42 $ 9.58 $ 32.83   $ 28.35  
Performance based restricted shares outstanding                   210,000 310,000 100,000  
Performance Based Stock Options Granted           415,000              
Service Based Stock Options Granted               797,450          
Cash received from exercise of stock options $ 1,441 $ 2,244 $ 3,624 $ 7,154                  
Tax benefit on options exercised 166 695 761 1,398                  
Total intrinsic value of options exercised     2,987 4,907                  
Total fair value of stock options vested 8,035 6,775 8,035 6,775                  
Stock Based Compensation (Textual) [Abstract]                          
Total stock compensation expense 2,102 2,527 7,592 9,396                  
Total stock compensation expense, net of tax 1,282 1,541 4,631 5,732                  
Unrealized compensation cost related to share-based compensation, pre tax $ 16,022   $ 16,022                    
Weighted average period remaining     2.0                    
Stock options exercisable 3,848,048 3,359,215 3,848,048 3,359,215                  
Weighted average exercise price of options exercisable $ 29.67 $ 29.70 $ 29.67 $ 29.70