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Stock Option Plan and Stock Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2014
Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unissued common stock reserved 775,767   775,767  
Stock option award maximum term     10 years  
Share based compensation arrangements by share based payment award vesting period maximum     5 years  
Unrecognized compensation cost related to unvested stock options granted $ 0.2   $ 0.2  
Fair value of shares underlying the options vested     0.9  
Remaining unrecognized compensation cost related to unvested restricted stock 1.9   1.9  
Weighted average remaining requisite service period of the unvested restricted stock awards     2 years  
Outstanding restricted stock underlying fair value at grant date 2.4   2.4  
Unvested Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining requisite service period of the unvested stock options     1 year 8 months 12 days  
Selling, General and Administrative Expenses [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense related share based compensation before tax 0.3 0.4 0.7 0.8
Compensation expense related share based compensation net of tax $ 0.2 $ 0.2 $ 0.4 $ 0.5