Annual report pursuant to Section 13 and 15(d)

Stock-Based Employee Compensation (Details 1)

v3.7.0.1
Stock-Based Employee Compensation (Details 1) - $ / shares
 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Number of Options [Rollforward]      
Number of Options, Outstanding, beginning of period (in shares) 9,541,393 13,613,615 15,314,074
Number of Options, Granted (in shares) 648,147 838,996 881,584
Number of Options, Exercised (in shares) (1,948,236) (4,689,588) (2,527,458)
Number of Options, Forfeited (in shares) (170,711) (220,433) (52,779)
Number of Options, Expired (in shares) (338) (1,197) (1,806)
Number of Options, Outstanding, end of period (in shares) 8,070,255 9,541,393 13,613,615
Number of Options, Exercisable (in shares) 6,456,382 7,348,309 10,499,030
Weighted Average Exercise Price [Rollforward]      
Options, Weighted Average Exercise Price, Outstanding, beginning of period (in dollars per share) $ 34.03 $ 25.46 $ 21.82
Options, Weighted Average Exercise Price, Granted (in dollars per share) 157.01 117.17 79.86
Options, Weighted Average Exercise Price, Exercised (in dollars per share) 25.79 22.25 22.02
Options, Weighted Average Exercise Price, Forfeited (in dollars per share) 109.23 71.75 42.79
Options, Weighted Average Exercise Price, Expired (in dollars per share) 31.92 21.02 19.55
Options, Weighted Average Exercise Price, Outstanding, end of period (in dollars per share) 44.31 34.03 25.46
Options, Weighted Average Exercise Price, Exercisable (in dollars per share) $ 26.66 $ 21.37 $ 19.45