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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, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | [1] | Feb. 29, 2016 | [1] | Nov. 30, 2015 | [1] | Aug. 31, 2015 | [1] | May 31, 2017 | May 31, 2016 | May 31, 2015
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,530,287 | $ 1,255,367 | $ 1,271,077 | $ 1,266,650 | $ 1,243,548 | $ 1,190,539 | $ 1,191,121 | $ 1,170,564 | $ 5,323,381 | $ 4,795,772 | $ 4,369,677
Gross margin | 678,726 | 559,924 | 565,218 | 576,427 | 546,371 | 517,853 | 520,221 | 516,895 | 2,380,295 | 2,101,340 | 1,892,923
Net income, continuing operations | $ 82,174 | $ 116,954 | $ 121,950 | $ 136,208 | $ 115,711 | $ 115,122 | $ 113,447 | $ 104,325 | $ 457,286 | $ 448,605 | $ 402,553
Basic earnings per share, continuing operations (dollars per share) | $ 0.76 | $ 1.09 | $ 1.15 | $ 1.27 | $ 1.07 | $ 1.05 | $ 1.03 | $ 0.93 | $ 4.27 | $ 4.08 | $ 3.44
Diluted earnings per share from continuing operations (in dollars per share) | $ 0.75 | $ 1.06 | $ 1.12 | $ 1.24 | $ 1.06 | $ 1.03 | $ 1.01 | $ 0.92 | $ 4.17 | $ 4.02 | $ 3.39
Weighted average number of shares outstanding (shares) | 105,325 | 105,093 | 104,957 | 104,483 | 106,136 | 107,843 | 108,301 | 110,597 | 104,964 | 108,221 | 115,900
[1] | The figures for fiscal 2016 reflect the change in classification of Discontinued Services as discontinued operations within the Consolidated Statements of Income. See Note 16 entitled Discontinued Operations for additional information.

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