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Quarterly Financial Data (Schedule Of Share Price And Dividends Paid) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2013 | Apr. 30, 2012
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends paid per share | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.15 | $ 0.15 | $ 0.80 | $ 0.70
High |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price range | $ 29.68 | $ 23.19 | $ 18.04 | $ 16.88 | $ 17.46 | $ 17.09 | $ 15.52 | $ 17.75 | $ 29.68 | $ 17.75
Low |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price range | $ 22.77 | $ 17.26 | $ 15.53 | $ 14.35 | $ 14.35 | $ 14.41 | $ 12.54 | $ 14.68 | $ 14.35 | $ 12.54

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- Details
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- Definition Stock Price Range + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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=6959260&loc=d3e187085-122770 + Details
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