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Marketable Securities (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Apr. 30, 2011	Jul. 31, 2011 Marketable Securities [Member]	Apr. 30, 2011 Marketable Securities [Member]
Deferred Compensation Liability	$ 80,100,000		$ 72,100,000
Trading Securities				79,200,000	71,400,000
Gross unrealized gain	(1,625,000)	(1,420,000)		2,600,000	6,800,000
Gross unrealized loss				400,000	100,000
Non-current portion of marketable securities, trading, for obligation of deferred compensation liability				$ 73,500,000	$ 66,300,000

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Non-Current Portion Of Marketable Securities, Trading, For Obligation Of Deferred Compensation Liability

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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Total investments, other than debt and equity securities, that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

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The increase (decrease) resulting in a gain from the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period.

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