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Quarterly Financial Data (Schedule Of Share Price And Dividends Paid) (Details) - $ / shares | 3 Months Ended | 12 Months Ended
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Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends paid per share | $ 0.24 | $ 0.24 | $ 0.24 | $ 0.24 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.96 | $ 0.88
High |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price range | 29.47 | 29.16 | 31.80 | 31.70 | 24.82 | 24.06 | 24.95 | 24.53 | 31.80 | 24.95
Low |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price range | $ 23.80 | $ 23.59 | $ 24.59 | $ 24.55 | $ 19.85 | $ 20.91 | $ 20.58 | $ 19.18 | $ 23.59 | $ 19.18

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- Definition Quarterly Financial Data [Line Items] + References No definition available. + Details
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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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