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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

X

- Definition

The weighted average fair value for nonvested equity-based awards issued during the period on other than stock (or unit) options plans.

+ References

No definition available.

+ Details

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- Definition

Weighted average grant date fair values of equity.

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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

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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

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