XML 52 R38.htm IDEA: XBRL DOCUMENT v3.5.0.2
Stock Option Activity (Detail) - $ / shares
shares in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Shares Outstanding, Beginning Balance 1,988 1,869 2,092
Shares, Granted 549 536 512
Shares, Exercised (427) (380) (643)
Shares, Forfeited (29) (37) (92)
Shares Outstanding, Ending Balance 2,081 1,988 1,869
Weighted-Average Exercise Price, Beginning Balance $ 31.04 $ 25.69 $ 19.21
Weighted-Average Exercise Price, Granted 46.98 39.79 36.44
Weighted-Average Exercise Price, Exercised 23.47 16.69 13.69
Weighted-Average Exercise Price, Forfeited 38.57 33.55 22.08
Weighted-Average Exercise Price, Ending Balance 36.71 31.04 25.69
Weighted-Average Grant Date Fair Value, Beginning Balance 9.20 7.62 6.00
Weighted-Average Grant Date Fair Value, Granted 13.11 11.91 9.87
Weighted-Average Grant Date Fair Value, Exercised 7.15 5.17 4.28
Weighted-Average Grant Date Fair Value, Forfeited 11.14 9.45 6.65
Weighted-Average Grant Date Fair Value, Ending Balance $ 10.63 $ 9.20 $ 7.62