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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Consolidated Statements of Stockholders' Equity      
Exercise of stock options, tax benefits $ 0 $ 0 $ 1,581
Restricted share-based compensation, tax benefits $ 0 $ 0 $ 1,894