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Stock-Based Compensation - Information Related to Stock Options Outstanding (Details)
12 Months Ended
May 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number Outstanding (shares) | shares 8,419,907
Outstanding Options, Average Remaining Option Life 7 years 6 months 4 days
Outstanding Options, Weighted Average Exercise Price (dollars per share) $ 61.83
Exercisable Options, Number Exercisable (shares) | shares 1,649,236
Exercisable Options, Weighted Average Exercise Price (dollars per share) $ 34.32
Range of Exercise Prices, Lower Range Limit (dollars per share) 20.29
Range of Exercise Prices, Upper Range Limit (dollars per share) $ 95.09
$ 20.29 – $ 37.75  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number Outstanding (shares) | shares 1,555,054
Outstanding Options, Average Remaining Option Life 4 years 5 months 8 days
Outstanding Options, Weighted Average Exercise Price (dollars per share) $ 31.22
Exercisable Options, Number Exercisable (shares) | shares 1,122,463
Exercisable Options, Weighted Average Exercise Price (dollars per share) $ 29.87
Range of Exercise Prices, Lower Range Limit (dollars per share) 20.29
Range of Exercise Prices, Upper Range Limit (dollars per share) $ 37.75
37.76 – 47.22  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number Outstanding (shares) | shares 2,105,731
Outstanding Options, Average Remaining Option Life 6 years 3 months 29 days
Outstanding Options, Weighted Average Exercise Price (dollars per share) $ 42.33
Exercisable Options, Number Exercisable (shares) | shares 437,534
Exercisable Options, Weighted Average Exercise Price (dollars per share) $ 39.91
Range of Exercise Prices, Lower Range Limit (dollars per share) 37.76
Range of Exercise Prices, Upper Range Limit (dollars per share) $ 47.22
47.23 – 86.09  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number Outstanding (shares) | shares 1,824,303
Outstanding Options, Average Remaining Option Life 8 years 2 months 1 day
Outstanding Options, Weighted Average Exercise Price (dollars per share) $ 64.90
Exercisable Options, Number Exercisable (shares) | shares 89,239
Exercisable Options, Weighted Average Exercise Price (dollars per share) $ 62.96
Range of Exercise Prices, Lower Range Limit (dollars per share) 47.23
Range of Exercise Prices, Upper Range Limit (dollars per share) $ 86.09
86.10 – 95.09  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number Outstanding (shares) | shares 2,934,819
Outstanding Options, Average Remaining Option Life 9 years 6 months 29 days
Outstanding Options, Weighted Average Exercise Price (dollars per share) $ 90.54
Exercisable Options, Number Exercisable (shares) | shares 0
Exercisable Options, Weighted Average Exercise Price (dollars per share) $ 0.00
Range of Exercise Prices, Lower Range Limit (dollars per share) 86.10
Range of Exercise Prices, Upper Range Limit (dollars per share) $ 95.09