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Earnings per Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015 | Aug. 06, 2016 | Aug. 04, 2015 | Jan. 13, 2015 | Jul. 30, 2013
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Basic earnings per share, discontinued operations (dollars per share) | $ 0.22 | $ 2.22 | $ 0.24 |  |  |  |
Diluted earnings per share, discontinued operations (dollars per share) | $ 0.21 | $ 2.19 | $ 0.24 |  |  |  |
Options granted excluded from the computation of diluted earnings per share (shares) | 600 | 500 | 600 |  |  |  |
Total purchase price of shares repurchased | $ 20,724,000 | $ 780,151,000 | $ 551,970,000 |  |  |  |
Employee Payroll Taxes Due on Restricted Stock Awards |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Stock purchased under share buyback | 200 | 200 |  |  |  |  |
Avg. Price per Share (in dollars per share) | $ 101.37 | $ 86.07 |  |  |  |  |
Total purchase price of shares repurchased | $ 17,000,000 | $ 20,900,000 |  |  |  |  |
July 30, 2013 |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  | $ 500,000,000.0
Stock purchased under share buyback | 0 | 0 | 3,981 |  |  |  |
Avg. Price per Share (in dollars per share) | $ 0.00 | $ 0.00 | $ 75.49 |  |  |  |
Total purchase price of shares repurchased | $ 0 | $ 0 | $ 300,500,000 |  |  |  |
January 13, 2015 |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  | $ 500,000,000.0 |
Stock purchased under share buyback | 0 | 3,078 | 2,870 |  |  |  |
Avg. Price per Share (in dollars per share) | $ 0.00 | $ 85.44 | $ 82.60 |  |  |  |
Total purchase price of shares repurchased | $ 0 | $ 262,928,000 | $ 237,072,000 |  |  |  |
August 4, 2015 |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  | $ 500,000,000.0 |  |
Stock purchased under share buyback | 39 | 5,649 | 0 |  |  |  |
Avg. Price per Share (in dollars per share) | $ 94.09 | $ 87.85 | $ 0.00 |  |  |  |
Total purchase price of shares repurchased | $ 3,691,000 | $ 496,309,000 | $ 0 |  |  |  |
August 6, 2016 |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  | $ 500,000,000.0 |  |  |
Stock purchased under share buyback | 0 | 0 | 0 |  |  |  |
Avg. Price per Share (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 |  |  |  |
Total purchase price of shares repurchased | $ 0 | $ 0 | $ 0 |  |  |  |

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