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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,669,550 | $ 1,589,138 | $ 1,606,441 | $ 1,611,503 | $ 1,530,287 | $ 1,255,367 | $ 1,271,077 | $ 1,266,650 | $ 6,476,632 | $ 5,323,381 | $ 4,795,772
Gross margin | 752,338 | 700,463 | 716,369 | 739,353 | 678,726 | 559,924 | 565,218 | 576,427 | 2,908,523 | 2,380,295 | 2,101,340
Net income, continuing operations | $ 189,298 | $ 295,789 | $ 137,737 | $ 161,108 | $ 82,174 | $ 116,954 | $ 121,950 | $ 136,208 | $ 783,932 | $ 457,286 | $ 448,605
Basic earnings per share, continuing operations (dollars per share) | $ 1.74 | $ 2.73 | $ 1.27 | $ 1.50 | $ 0.76 | $ 1.09 | $ 1.15 | $ 1.27 | $ 7.24 | $ 4.27 | $ 4.08
Diluted earnings per share, continuing operations (in dollars per share) | $ 1.68 | $ 2.66 | $ 1.24 | $ 1.45 | $ 0.75 | $ 1.06 | $ 1.12 | $ 1.24 | $ 7.03 | $ 4.17 | $ 4.02
Weighted average number of shares outstanding (shares) | 106,593 | 106,558 | 106,340 | 105,740 | 105,325 | 105,093 | 104,957 | 104,483 | 106,593 | 104,964 | 108,221

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