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Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended |
--- | --- | ---
Aug. 31, 2017 | Aug. 31, 2016 | Aug. 02, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Discontinued operations (in dollars per share) | $ 0.52 | $ 0.02 |
Discontinued operations (in dollars per share) | $ 0.51 | 0.02 |
Diluted earnings per share from discontinued operations (in dollars per share) |  | $ 0.02 |
Options granted and excluded from the computation of diluted earnings per share (in shares) | 0.6 | 0.7 |
Employee Payroll Taxes Due on Restricted Stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Shares acquired (in shares) | 0.3 |  |
Stock purchased under share buyback, average price per share (in dollars per share) | $ 128.70 |  |
Total purchase price of shares repurchased | $ 35,000,000 |  |
Share Buyback Program, August 2, 2016 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Share buyback program, authorized amount |  |  | $ 500,000,000.0

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