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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
9 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Total cash received   $ 69
Total grant-date fair value $ 201 345
Intrinsic value $ 267 $ 534