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COMMON SHARES (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Oct. 31, 2010
Jan. 31, 2009
Jan. 31, 2008
Feb. 28, 2013
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Feb. 29, 2012
Feb. 28, 2011
Common shares            
Number of classes of common shares       2    
Net proceeds from IPO $ 127.0          
Class A Common shares
            
Common shares            
Number of votes to which holders of common shares are entitled for each share held       1    
Number of Class A common shares into which each Class B common share is convertible       1    
Shares issued 27,600,000         27,600,000
Common shares, par value (in dollars per share)       $ 0.001 $ 0.001  
Conversion of Class B common shares to Class A common shares (in shares)       21,875,000 15,319,000  
Common shares were cancelled upon the completion of the share repurchase       577,938    
Shares issued related to vesting and conversion of non-vested shares       1,740,044 2,358,044  
Class B Common shares
            
Common shares            
Number of votes to which holders of common shares are entitled for each share held       10    
Shares issued   119,999,000 1,000      
Common shares, par value (in dollars per share)     $ 0.001 $ 0.001 $ 0.001  
Common shares issued due to conversion of convertible shares 5,000,000         5,000,000
Conversion of Class B common shares to Class A common shares (in shares)       (21,875,000) (15,319,000)  
American Depository Shares
            
Common shares            
Shares issued 13,800,000          
American Depository Shares | Non-vested shares
            
Common shares            
Non-vested shares vested and converted into American Depository Shares       1,740,044 2,358,044  
Shares issued related to vesting and conversion of non-vested shares       870,022 1,179,022  
Series A convertible redeemable preferred shares
            
Common shares            
Number of convertible shares converted 5,000,000