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Stock Option Plan and Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
May 31, 2019
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unissued common stock reserved 582,853  
Stock option award maximum term 10 years  
Share based compensation arrangements by share based payment award vesting period maximum 5 years  
Number of outstanding vested and unvested stock options 0  
Number of stock options granted 0 0
Number of unvested stock options outstanding 0  
Remaining unrecognized compensation cost related to unvested restricted stock $ 2.4  
Weighted average remaining requisite service period of the unvested restricted stock awards 2 years 1 month 6 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 $ 0.4 $ 0.3