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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 341,250    
Number of shares available for grants 2,300,000    
Multi-employer plan contribution expense $ 0.3 $ 0.3 $ 0.3
Two Thousand Twelve Equity Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grants 2,000,000    
Two Thousand Seventeen Equity Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares that may be granted 2,000,000    
Number of shares available for grants 2,000,000    
Two Thousand Seventeen Equity Compensation Plan [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration of Stock option under the plan 10 years    
401 (k) Retirement Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Minimum age for retirement saving plan 18 years    
Minimum days of service required to participate in retirement savings plan 30 days    
Maximum percentage of eligible compensation by employee 50.00%    
Maximum employer match on employee's contribution 33.00%    
Employer matching contribution on employee's salary percentage 6.00%    
Employer discretionary contribution   $ 0.9