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Share Based Payments - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Feb. 15, 2013
Stock Options
Feb. 15, 2013
Restricted Stock
Feb. 28, 2014
Restricted Stock
Feb. 28, 2013
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted, term 10 years            
Stock options vesting period 3 years            
Annual percentage over three years 33.33%            
Cash received from exercise of stock options $ 0.3 $ 0.3 $ 0.1        
Stock options weighted average grant date fair value $ 1.67 $ 0.77          
Shares available for future grants 3,000,000            
Restricted stock awards requisite service period           3 years  
Stock options cancelled 32,500     2,200,000      
Issuance of restricted stock         500,000    
Incremental accounting cost of restricted stock           0.1 0.1
Grant date fair value of shares vested 2.2 1.4 1.0        
Unrecognized compensation cost $ 2.3            
Compensation cost of weighted average period 1 year 7 months 1 day