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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015
Basic Earnings per Share from Continuing Operations |  |  |  |
Income from continuing operations | $ 123,454 | $ 115,453 | $ 261,545 | $ 221,651
Less: income from continuing operations allocated to participating securities | 2,228 | 1,887 | 4,955 | 3,629
Income from continuing operations available to common shareholders | $ 121,226 | $ 113,566 | $ 256,590 | $ 218,022
Basic weighted average common shares outstanding (shares) | 104,957 | 108,301 | 104,719 | 109,455
Basic earnings per common share: |  |  |  |
Basic earnings per share from continuing operations (dollars per share) | $ 1.16 | $ 1.05 | $ 2.45 | $ 1.99
Diluted Earnings per Share from Continuing Operations |  |  |  |
Income from continuing operations | $ 123,454 | $ 115,453 | $ 261,545 | $ 221,651
Less: income from continuing operations allocated to participating securities | 2,228 | 1,887 | 4,955 | 3,629
Income from continuing operations available to common shareholders | $ 121,226 | $ 113,566 | $ 256,590 | $ 218,022
Basic weighted average common shares outstanding (shares) | 104,957 | 108,301 | 104,719 | 109,455
Effect of dilutive securities - employee stock options (shares) | 2,690 | 1,812 | 2,559 | 1,685
Diluted weighted average common shares outstanding (shares) | 107,647 | 110,113 | 107,278 | 111,140
Diluted earnings per share: |  |  |  |
Diluted earnings per share from continuing operations (dollars per share) | $ 1.13 | $ 1.03 | $ 2.39 | $ 1.96

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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4613673-111683 + Details
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