Share-Based Payments (Details 1) (USD $)	12 Months Ended
Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Performance Units [Member]
Weighted-average grant date fair values of the equity awards
Granted Restricted Shares and Deferred Stock Units and Performance Units	101,020	106,666	99,455
Granted Weighted Average Conversion Date Fair Value, in USD per share	$ 104.91	$ 100.54	$ 76.37
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	167,134	109,770	152,180
Granted Weighted Average Grant Date Fair Value, in USD per share	$ 101.08	$ 76.37	$ 78.32

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

No definition available.

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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

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