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Earnings Per Share - Buyback Activity by Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 28 Months Ended
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2018 | Nov. 30, 2018
Share Repurchase Programs |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares | 1,941 | 2,331 |
Avg. Price per Share (in dollars per share) | $ 189.69 | $ 191.58 |
Purchase Price | $ 368,126 | $ 446,582 |
August 2, 2016 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares | 1,740 | 2,130 | 2,600
Avg. Price per Share (in dollars per share) | $ 190.66 | $ 192.55 | $ 188.82
Purchase Price | $ 331,547 | $ 410,003 | $ 500,000
October 30, 2018 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares | 201 | 201 |
Avg. Price per Share (in dollars per share) | $ 181.41 | $ 181.41 |
Purchase Price | $ 36,579 | $ 36,579 |

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