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Stock Option Plan and Stock Based Compensation - Summary of Stock Options Exercised and Tax Benefits Realized from Stock Based Compensation (Detail) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2017
May 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Total cash received   $ 2,910
Income tax benefits $ 0 0
Total grant-date fair value   532
Intrinsic value   $ 969