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Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 28 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 08, 2019 | Jan. 08, 2019 | Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Oct. 30, 2018 | Aug. 02, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Basic earnings (loss) from discontinued operations (in dollars per share) |  |  | $ 0.00 | $ (0.01) | $ 0.00 | $ 0.51 |  |  |
Diluted earnings from discontinued operations (in dollars per share) |  |  | $ 0.00 | $ (0.01) | $ 0.00 | $ 0.50 |  |  |
Options granted and excluded from the computation of diluted earnings per share (in shares) |  |  | 400 | 500 | 400 | 600 |  |  |
Employee Payroll Taxes Due on Restricted Stock |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Shares |  |  | 100 |  | 300 |  |  |  |
Stock purchased under share buyback, average price per share (in dollars per share) |  |  | $ 194.14 |  | $ 204.32 |  |  |  |
Purchase Price |  |  | $ 400,000 |  | $ 61,500,000 |  |  |  |
August 2, 2016 |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  |  | $ 500,000,000.0
Shares |  |  | 1,740 |  | 2,130 |  | 2,600 |  |
Stock purchased under share buyback, average price per share (in dollars per share) |  |  | $ 190.66 |  | $ 192.55 |  | $ 188.82 |  |
Purchase Price |  |  | $ 331,547,000 |  | $ 410,003,000 |  | $ 500,000,000 |  |
October 30, 2018 |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  | $ 1,000,000,000.0 |
Shares |  |  | 201 |  | 201 |  |  |  |
Stock purchased under share buyback, average price per share (in dollars per share) |  |  | $ 181.41 |  | $ 181.41 |  |  |  |
Purchase Price |  |  | $ 36,579,000 |  | $ 36,579,000 |  |  |  |
Subsequent Event | October 30, 2018 |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Shares | 600 | 800 |  |  |  |  |  |  |
Stock purchased under share buyback, average price per share (in dollars per share) | $ 167.32 | $ 170.87 |  |  |  |  |  |  |
Purchase Price | $ 100,000,000 | $ 136,600,000 |  |  |  |  |  |  |

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