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Quarterly Financial Data (Schedule of Share Price and Dividends Paid) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2011 | Jan. 31, 2011 | Oct. 31, 2010 | Jul. 31, 2010 | Apr. 30, 2010 | Jan. 31, 2010 | Oct. 31, 2009 | Jul. 31, 2009 | Apr. 30, 2011 | Apr. 30, 2010
Dividends paid per share | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.6 | $ 0.6
High [Member] |  |  |  |  |  |  |  |  |  |
Stock price range | $ 18.00 | $ 13.79 | $ 15.97 | $ 18.99 | $ 21.84 | $ 23.23 | $ 20.00 | $ 17.85 | $ 18.99 | $ 23.23
Low [Member] |  |  |  |  |  |  |  |  |  |
Stock price range | $ 12.46 | $ 11.15 | $ 10.13 | $ 13.44 | $ 15.90 | $ 18.10 | $ 16.41 | $ 13.73 | $ 10.13 | $ 13.73

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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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