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Share-Based Payments (Details 3) - $ / shares | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Restricted Shares And Deferred Stock Units [Member] |  |  |
Weighted-average grant date fair values of the equity awards |  |  |
Granted Restricted Shares and Deferred Stock Units and Performance Units | 109,091 | 167,134 | 109,770
Granted Weighted Average Grant Date Fair Value, in USD per share | $ 104.82 | $ 101.08 | $ 76.37
Performance Units [Member] |  |  |
Weighted-average grant date fair values of the equity awards |  |  |
Granted Restricted Shares and Deferred Stock Units and Performance Units | 75,848 | 101,020 | 106,666
Granted Weighted Average Conversion Date Fair Value, in USD per share | $ 111.41 | $ 104.91 | $ 100.54

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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