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Stock-Based Compensation (Details Textual) (USD $)
12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Jun. 30, 2010
Jan. 31, 2012
Employee Stock Option [Member]
Y
Jan. 31, 2011
Employee Stock Option [Member]
Jan. 31, 2010
Employee Stock Option [Member]
Jan. 31, 2012
Restricted Stock [Member]
Y
Jan. 31, 2011
Restricted Stock [Member]
Jan. 31, 2010
Restricted Stock [Member]
Jan. 31, 2012
Restricted Shares and Performance Shares [Member]
Jun. 30, 2010
Restricted Shares and Performance Shares [Member]
Jun. 30, 2008
Performance Shares [Member]
Jan. 31, 2012
Performance Shares [Member]
Jun. 30, 2008
Performance Shares [Member]
Executive [Member]
Jan. 31, 2012
Performance Shares [Member]
Maximum [Member]
Jan. 31, 2012
Performance Shares [Member]
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Maximum number of shares to be issued       16,750,000               5,400,000          
Number of shares available for granting 4,289,404                   2,572,837            
Maximum Annual Award to Individuals         400,000     225,000           100,000      
Maximum term of stock options         10 years                        
Vesting period of stock options         over 3 to 4 years                        
Vesting period minimum         3 years     3 years                  
Vesting period maximum         4 years     4 years                  
Unrecognized compensation cost         $ 5,100,000     $ 16,757,000           $ 0      
Weighted average period of unrecognized compensation cost         2.66     2.60                  
Grant date fair value               $ 17.72 $ 15.89 $ 7.80     $ 36.38        
Shares, Granted               730,554             172,609    
Total intrinsic value of stock option exercised         84,000 389,000 72,000                    
Cash received from stock option exercised         195,000 2,621,000 128,000                    
Income tax benefit realized         0 0 0                    
Unvested shares of restricted stock were excluded from issued and outstanding shares of Class A common stock               0                  
Total fair value of shares that vested               8,503,000 8,821,000 5,884,000              
Percentage of shares earned                               175.00% 0.00%
Fair value of stock options grant date         $ 11.20 $ 9.99 $ 4.56                    
Purchase of treasury stock 1,670,000 786,000 133,000                            
Stock Based Compensation (Textual) [Abstract]                                  
Amount of grant date fair value expensed immediately for awards granted to retirement-eligible grantees 1,022,000 1,136,000 350,000                            
Purchase of treasury stock, Shares 90,104 54,732 26,188                            
Stock based compensation reversed $ 1,622,000