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Earnings per Share - Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018
Diluted Earnings per Share from Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 144,585 | $ 234,520 | $ 246,443 | $ 250,812 | $ 226,171 | $ 200,923 | $ 242,994 | $ 212,547 | $ 876,360 | $ 882,635 | $ 783,932
Less: income from continuing operations allocated to participating securities |  |  |  |  |  |  |  |  | 8,158 | 9,568 | 11,794
Income from continuing operations available to common shareholders |  |  |  |  |  |  |  |  | $ 868,202 | $ 873,067 | $ 772,138
Basic weighted average common shares outstanding (shares) | 103,758 | 104,245 | 103,959 | 103,543 | 105,018 | 105,080 | 106,475 | 106,835 | 103,816 | 106,080 | 106,593
Effect of dilutive securities - employee stock options (shares) |  |  |  |  |  |  |  |  | 3,196 | 3,415 | 3,217
Diluted weighted average common shares outstanding (shares) |  |  |  |  |  |  |  |  | 107,012 | 109,495 | 109,810
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share from continuing operations (in dollars per share) | $ 1.35 | $ 2.16 | $ 2.27 | $ 2.32 | $ 2.06 | $ 1.83 | $ 2.18 | $ 1.89 | $ 8.11 | $ 7.97 | $ 7.03

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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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