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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, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Basic Earnings per Share from Continuing Operations |  |  |  |
Income from continuing operations | $ 242,994 | $ 137,737 | $ 455,541 | $ 298,845
Less: income from continuing operations allocated to participating securities | 3,376 | 2,111 | 6,308 | 5,298
Income from continuing operations available to common shareholders | $ 239,618 | $ 135,626 | $ 449,233 | $ 293,547
Basic weighted average common shares outstanding (in shares) | 106,475 | 106,340 | 106,652 | 106,039
Basic earnings per share from continuing operations (in dollars per share) | $ 2.25 | $ 1.27 | $ 4.21 | $ 2.77
Diluted Earnings per Share from Continuing Operations |  |  |  |
Income from continuing operations | $ 242,994 | $ 137,737 | $ 455,541 | $ 298,845
Less: income from continuing operations allocated to participating securities | 3,376 | 2,111 | 6,308 | 5,298
Income from continuing operations available to common shareholders | $ 239,618 | $ 135,626 | $ 449,233 | $ 293,547
Basic weighted average common shares outstanding (in shares) | 106,475 | 106,340 | 106,652 | 106,039
Effect of dilutive securities - employee stock options (in shares) | 3,399 | 3,478 | 3,605 | 2,899
Diluted weighted average common shares outstanding (in shares) | 109,874 | 109,818 | 110,257 | 108,938
Diluted earnings per share from continuing operations (in dollars per share) | $ 2.18 | $ 1.24 | $ 4.07 | $ 2.69

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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period) and earnings allocated (not distributed) to participating securities. + References No definition available. + Details
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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4613673-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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