Share-Based Payments (Details) (USD $)	12 Months Ended
Apr. 30, 2011
Summary of the Company's stock option activity and related information
Outstanding at May 1, 2010	711,987
Weighted Average-Exercise Price Outstanding at May 1, 2010	$ 41.06
Options Exercised	(515,062)
Weighted Average-Exercise Price Exercised	$ 41.01
Outstanding and exercisable at April 30, 2011	196,925
Weighted Average-Exercise Price Outstanding and exercisable at April 30, 2011	$ 41.18

The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding and exercisable as of the balance-sheet date.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding and Exercisable, Weighted Average Exercise Price.

+ Details

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- Definition

Summary of the Company's stock option activity and related information.

+ Details

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- Definition

The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(e)

+ Details

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