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Earnings per Share - Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2019 | May 31, 2018 | May 31, 2017
Basic Earnings per Share from Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 226,171 | $ 200,923 | $ 242,994 | $ 212,547 | $ 189,298 | $ 295,789 | $ 137,737 | $ 161,108 | $ 882,635 | $ 783,932 | $ 457,286
Less: income from continuing operations allocated to participating securities |  |  |  |  |  |  |  |  | 9,568 | 11,794 | 8,168
Income from continuing operations available to common shareholders |  |  |  |  |  |  |  |  | $ 873,067 | $ 772,138 | $ 449,118
Basic weighted average common shares outstanding (shares) | 105,018 | 105,080 | 106,475 | 106,835 | 106,593 | 106,558 | 106,340 | 105,740 | 106,080 | 106,593 | 104,964
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share from continuing operations (dollars per share) | $ 2.13 | $ 1.89 | $ 2.25 | $ 1.96 | $ 1.74 | $ 2.73 | $ 1.27 | $ 1.50 | $ 8.23 | $ 7.24 | $ 4.27

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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=116634182&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=118932676&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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