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Earnings per Share - Computation of Basic Earnings Per Share For Continuing Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Basic Earnings per Share from Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 189,298 | $ 295,789 | $ 137,737 | $ 161,108 | $ 82,174 | $ 116,954 | $ 121,950 | $ 136,208 | $ 783,932 | $ 457,286 | $ 448,605
Less: income from continuing operations allocated to participating securities |  |  |  |  |  |  |  |  | 11,794 | 8,168 | 7,131
Income from continuing operations available to common shareholders |  |  |  |  |  |  |  |  | $ 772,138 | $ 449,118 | $ 441,474
Basic weighted average common shares outstanding (shares) | 106,593 | 106,558 | 106,340 | 105,740 | 105,325 | 105,093 | 104,957 | 104,483 | 106,593 | 104,964 | 108,221
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share, continuing operations (dollars per share) | $ 1.74 | $ 2.73 | $ 1.27 | $ 1.50 | $ 0.76 | $ 1.09 | $ 1.15 | $ 1.27 | $ 7.24 | $ 4.27 | $ 4.08

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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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