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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,619,584 | $ 1,810,648 | $ 1,843,749 | $ 1,811,139 | $ 1,793,730 | $ 1,682,330 | $ 1,718,268 | $ 1,697,975 |  |  |
Gross margin | 707,820 | 824,395 | 852,391 | 849,142 | 823,565 | 755,153 | 775,158 | 774,712 | $ 3,233,748 | $ 3,128,588 | $ 2,908,523
Income from continuing operations | $ 144,585 | $ 234,520 | $ 246,443 | $ 250,812 | $ 226,171 | $ 200,923 | $ 242,994 | $ 212,547 | $ 876,360 | $ 882,635 | $ 783,932
Basic earnings per share, continuing operations (dollars per share) | $ 1.38 | $ 2.23 | $ 2.35 | $ 2.40 | $ 2.13 | $ 1.89 | $ 2.25 | $ 1.96 | $ 8.36 | $ 8.23 | $ 7.24
Diluted earnings per share, continuing operations (in dollars per share) | $ 1.35 | $ 2.16 | $ 2.27 | $ 2.32 | $ 2.06 | $ 1.83 | $ 2.18 | $ 1.89 | $ 8.11 | $ 7.97 | $ 7.03
Weighted average number of shares outstanding (shares) | 103,758 | 104,245 | 103,959 | 103,543 | 105,018 | 105,080 | 106,475 | 106,835 | 103,816 | 106,080 | 106,593

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