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Share-Based Compensation Plans - Non-vested stock option activity (Details) - Stock options - $ / shares
shares in Thousands
12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Non-Vested Options      
Outstanding at the beginning of the period (in shares) 125 280 521
Grants (in shares) 0 0 2
Vested or forfeited (in shares) (88) (155) (243)
Outstanding at the end of the period (in shares) 37 125 280
Weighted Average Grant Date Fair Value (per share)      
Outstanding at the beginning of the period (in usd per share) $ 19.31 $ 22.48 $ 20.81
Grants (in usd per share) 0.00 0.00 28.74
Vested or forfeited (in usd per share) 14.67 25.02 18.95
Outstanding at the end of the period (in usd per share) $ 30.44 $ 19.31 $ 22.48