Share-Based Payments (Details 1) (USD $)	12 Months Ended
Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Deferred Compensation, Share-based Payments [Member]
Summary of the Company's Restricted shares Deferred shares Deferred stock units and Performance units
Beginning Balance, Restricted/Deferred Shares and Deferred Stock Units and Performance Units	1,078,722
Beginning Balance, Weighted Average Grant Date Fair Value, in USD per share	$ 44.74
Granted Restricted/Deferred Shares and Deferred Stock Units and Performance Units	303,863	504,580	570,359
Converted Restricted/Deferred Shares and Deferred Stock Units and Performance Units	190,010
Vested Restricted/Deferred Shares and Deferred Stock Units and Performance Units	(373,522)
Forfeited Restricted/Deferred Shares and Deferred Stock Units and Performance Units	(41,807)
Granted weighted average grant date fair value, in USD per share	$ 58.32	$ 44.63	$ 42.29
Converted Weighted Average Grant Date Fair Value, in USD per share	$ 57.37
Vested Weighted Average Grant Date Fair Value, in USD per share	$ 47.33
Forfeited Weighted Average Grant Date Fair Value, [in USD per share]	$ 49.08
Ending Balance, Restricted/Deferred Shares and Deferred Stock Units and Performance Units	1,157,266	1,078,722
Ending Balance, Weighted Average Grant Date Fair Value, in USD per share	$ 49.39	$ 44.74
Performance Units [Member]
Summary of the Company's Restricted shares Deferred shares Deferred stock units and Performance units
Beginning Balance, Restricted/Deferred Shares and Deferred Stock Units and Performance Units	190,010
Beginning Balance, Weighted Average Grant Date Fair Value, in USD per share	$ 57.37
Granted Restricted/Deferred Shares and Deferred Stock Units and Performance Units	125,360	190,010	114,440
Converted Restricted/Deferred Shares and Deferred Stock Units and Performance Units	(190,010)
Vested Restricted/Deferred Shares and Deferred Stock Units and Performance Units	0
Forfeited Restricted/Deferred Shares and Deferred Stock Units and Performance Units	0
Granted weighted average grant date fair value, in USD per share	$ 77.53	$ 57.37	$ 43.44
Converted Weighted Average Grant Date Fair Value, in USD per share	$ 57.37
Vested Weighted Average Grant Date Fair Value, in USD per share	$ 0
Forfeited Weighted Average Grant Date Fair Value, [in USD per share]	$ 0
Ending Balance, Restricted/Deferred Shares and Deferred Stock Units and Performance Units	125,360	190,010
Ending Balance, Weighted Average Grant Date Fair Value, in USD per share	$ 77.53	$ 57.37

The weighted average fair value as of the grant date of share-based award plans other than stock option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The weighted average fair value as of grant dates pertaining to a share-based award other than a stock option plan (performance units) received by executives that were converted to restricted stock in the most recent accounting period as a result of the grantee gaining right during the reporting period by satisfying service and performance requirements, to receive or retain shares in accordance with the terms of the arrangement.

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Performance units received by executives that were converted to restricted stock in the most recent accounting period.

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The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

+ References

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The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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The weighted average fair value as of grant dates pertaining to a share-based award plan other than a stock option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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