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Stock Option Plan and Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unissued common stock reserved 638,693   638,693  
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 $ 0.1   $ 0.1  
Remaining unrecognized compensation cost related to unvested restricted stock 2.3   $ 2.3  
Weighted average remaining requisite service period of the unvested restricted stock awards     2 years 1 month 6 days  
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     2 years  
Selling, General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense related share based compensation before tax 0.4 $ 0.3 $ 0.7 $ 0.7
Compensation expense related share based compensation net of tax $ 0.2 $ 0.2 $ 0.4 $ 0.4