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Common Shares and Stock Based Compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2010
Feb. 28, 2009
Common Shares and Stock Based Compensation (Textual) [Abstract]        
Total stock-based compensation expense, before tax $ 10,982 $ 13,017 $ 5,819  
Period of unrecognized compensation expense, recognized 1      
Cash received from stock options exercised 13,310 18,842 5,834  
Actual tax benefit realized from the exercise of share-based payment arrangements 6,705 6,510 762  
Stock options granted         
Stock Options [Member]
       
Class of Stock [Line Items]        
Unrecognized compensation expense , before taxes 508      
Weighted average fair value per share of options granted   $ 10.43 $ 2.83  
Total intrinsic value of options exercised 17,117 16,666 1,985  
Period of commencement of option exercisable twelve months after the date of grant      
Period of expiration of stock option not more than ten years      
Performance Shares [Member]
       
Class of Stock [Line Items]        
Period of performance of management objectives to receive common shares     3 years 2 years
Compensation expense related to the performance shares     0  
Fair value per share of the performance and restricted shares   $ 10.20 $ 9.67  
Period required for the shares to continuing service two or three years      
Unrecognized compensation expense , before taxes 996      
Performance Shares [Member] | Amended Plan [Member]
       
Class of Stock [Line Items]        
Number of performance shares awarded   746,000 709,000  
Performance Shares [Member] | Original Plan [Member]
       
Class of Stock [Line Items]        
Number of performance shares awarded 0   59,864  
Share based compensation arrangement by share based payment award equity instruments performance shares initially granted       59,864
Restricted Stock Units [Member]
       
Class of Stock [Line Items]        
Fair value per share of the performance and restricted shares $ 22.64 $ 23.65    
Period required for the shares to continuing service 2 years      
Unrecognized compensation expense , before taxes 2,901      
Common shares - Class A [Member]
       
Class of Stock [Line Items]        
Common shares authorized 187,600,000 187,600,000    
Number of voting right per share one vote per share      
Issuance of additional common stock     1,600,000  
Number of shares available for future grant 963,234      
Common Shares and Stock Based Compensation (Textual) [Abstract]        
Stock options granted         
Common shares - Class A [Member] | Performance Shares [Member]
       
Class of Stock [Line Items]        
Cost incurred on receiving common shares by employees 0      
Common shares - Class A [Member] | Restricted Stock Units [Member]
       
Class of Stock [Line Items]        
Cost incurred on receiving common shares by employees 0      
Common shares - Class B [Member]
       
Class of Stock [Line Items]        
Common shares authorized 15,832,968 15,832,968    
Number of voting right per share ten vote per share      
Issuance of additional common stock     400,000  
Number of shares available for future grant 139,920      
Common Shares and Stock Based Compensation (Textual) [Abstract]        
Stock options granted         
Common shares - Class B [Member] | Performance Shares [Member]
       
Class of Stock [Line Items]        
Cost incurred on receiving common shares by employees 0      
Common shares - Class B [Member] | Restricted Stock Units [Member]
       
Class of Stock [Line Items]        
Cost incurred on receiving common shares by employees $ 0