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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.22 | $ 0.20 | $ 0.42 | $ 0.38
Dividends declared per preferred share (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.10 | $ 0.10

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of preferred stock outstanding. + References No definition available. + Details
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- References No definition available. + Details
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