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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 | 9 Months Ended
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Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Basic Earnings per Share from Continuing Operations |  |  |  |
Income from continuing operations | $ 200,923 | $ 295,789 | $ 656,464 | $ 594,634
Less: income from continuing operations allocated to participating securities | 2,783 | 5,248 | 8,977 | 10,546
Income from continuing operations available to common shareholders | $ 198,140 | $ 290,541 | $ 647,487 | $ 584,088
Basic weighted average common shares outstanding (in shares) | 105,080 | 106,558 | 106,147 | 106,210
Basic earnings per share from continuing operations (in dollars per share) | $ 1.89 | $ 2.73 | $ 6.10 | $ 5.50
Diluted Earnings per Share from Continuing Operations |  |  |  |
Income from continuing operations | $ 200,923 | $ 295,789 | $ 656,464 | $ 594,634
Less: income from continuing operations allocated to participating securities | 2,783 | 5,248 | 8,977 | 10,546
Income from continuing operations available to common shareholders | $ 198,140 | $ 290,541 | $ 647,487 | $ 584,088
Basic weighted average common shares outstanding (in shares) | 105,080 | 106,558 | 106,147 | 106,210
Effect of dilutive securities - employee stock options (in shares) | 3,082 | 3,617 | 3,436 | 3,044
Diluted weighted average common shares outstanding (in shares) | 108,162 | 110,175 | 109,583 | 109,254
Diluted earnings per share from continuing operations (in dollars per share) | $ 1.83 | $ 2.66 | $ 5.91 | $ 5.35

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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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