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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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May 31, 2017
Quarterly Financial Data [Abstract] |
Summary of Results of Operations for Each Quarter | The following is a summary of the results of operation for each of the quarters within the fiscal years ended May 31, 2017 and 2016:
May 31, 2017 (in thousands) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Revenue | $ | 1,266,650 |  |  | $ | 1,271,077 |  |  | $ | 1,255,367 |  |  | $ | 1,530,287 |
Gross margin | $ | 576,427 |  |  | $ | 565,218 |  |  | $ | 559,924 |  |  | $ | 678,726 |
Net income, continuing operations | $ | 136,208 |  |  | $ | 121,950 |  |  | $ | 116,954 |  |  | $ | 82,174 |
Basic earnings per share, continuing operations | $ | 1.27 |  |  | $ | 1.15 |  |  | $ | 1.09 |  |  | $ | 0.76 |
Diluted earnings per share, continuing operations | $ | 1.24 |  |  | $ | 1.12 |  |  | $ | 1.06 |  |  | $ | 0.75 |
Weighted average number of shares outstanding | 104,483 |  |  | 104,957 |  |  | 105,093 |  |  | 105,325 |
May 31, 2016 (in thousands) (1) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Revenue | $ | 1,170,564 |  |  | $ | 1,191,121 |  |  | $ | 1,190,539 |  |  | $ | 1,243,548 |
Gross margin | $ | 516,895 |  |  | $ | 520,221 |  |  | $ | 517,853 |  |  | $ | 546,371 |
Net income, continuing operations | $ | 104,325 |  |  | $ | 113,447 |  |  | $ | 115,122 |  |  | $ | 115,711 |
Basic earnings per share, continuing operations | $ | 0.93 |  |  | $ | 1.03 |  |  | $ | 1.05 |  |  | $ | 1.07 |
Diluted earnings per share, continuing operations | $ | 0.92 |  |  | $ | 1.01 |  |  | $ | 1.03 |  |  | $ | 1.06 |
Weighted average number of shares outstanding | 110,597 |  |  | 108,301 |  |  | 107,843 |  |  | 106,136 |
(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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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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