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Earnings per Share - Antidilution (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Employee stock options        
Antidilutive securities        
Antidilutive securities (in shares) 194 300 352 339