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Stock Option Plan and Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unissued common stock reserved 529,408   529,408  
Stock option award maximum term     10 years  
Share based compensation arrangements by share based payment award vesting period maximum     5 years  
Number of stock options granted     0 0
Unrecognized compensation cost related to unvested stock options granted $ 1,400   $ 1,400  
Remaining unrecognized compensation cost related to unvested restricted stock 2,100,000   $ 2,100,000  
Weighted average remaining requisite service period of the unvested restricted stock awards     1 year 10 months 25 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     7 months 6 days  
Selling, General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense related share based compensation before tax 400,000 $ 400,000 $ 700,000 $ 700,000
Compensation expense related share based compensation net of tax $ 200,000 $ 200,000 $ 400,000 $ 400,000