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Earnings Per Share - Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019
Basic earnings per share: |  |  |  |
Income from continuing operations | $ 284,857 | $ 246,443 | $ 584,862 | $ 497,255
Less: income from continuing operations allocated to participating securities | 2,015 | 2,425 | 4,153 | 4,904
Income from continuing operations available to common shareholders | $ 282,842 | $ 244,018 | $ 580,709 | $ 492,351
Basic weighted average common shares outstanding (in shares) | 104,999 | 103,959 | 104,546 | 103,638
Basic earnings per share from continuing operations (in dollars per share) | $ 2.69 | $ 2.35 | $ 5.55 | $ 4.75
Diluted earnings per share: |  |  |  |
Income from continuing operations | $ 284,857 | $ 246,443 | $ 584,862 | $ 497,255
Less: income from continuing operations allocated to participating securities | 2,015 | 2,425 | 4,153 | 4,904
Income from continuing operations available to common shareholders | $ 282,842 | $ 244,018 | $ 580,709 | $ 492,351
Basic weighted average common shares outstanding (in shares) | 104,999 | 103,959 | 104,546 | 103,638
Effect of dilutive securities - employee stock options (in shares) | 2,982 | 3,376 | 3,010 | 3,476
Diluted weighted average common shares outstanding (in shares) | 107,981 | 107,335 | 107,556 | 107,114
Diluted earnings per share from continuing operations (in dollars per share) | $ 2.62 | $ 2.27 | $ 5.40 | $ 4.60

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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://www.xbrl.org/2003/role/disclosureRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22595-107794 Reference 6: 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=120395209&loc=SL114868664-224227 Reference 7: 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=121586364&loc=d3e3602-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
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