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Marketable Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Oct. 31, 2011	Apr. 30, 2011
Deferred compensation liability	$ 78.7	$ 72.1
Marketable Securities [Member]
Trading securities	78.4	71.4
Gross unrealized gains	1.1	6.8
Gross unrealized losses	1.6	0.1
Non-current portion of marketable securities, trading, for obligation of deferred compensation liability	$ 72.3	$ 66.3
Maximum [Member]
Available for sale marketable securities, maturities period, maximum, in years	2.3
Minimum [Member]
Available for sale marketable securities, maturities period, minimum, in months	one

X

- Definition

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

+ References

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- Definition

The latest date, in a range of maturity dates, that a debt security categorized as neither trading nor held-to-maturity is scheduled to be repaid.

+ References

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- Definition

The earliest date, in a range of maturity dates, that a debt security categorized as neither trading nor held-to-maturity is scheduled to be repaid.

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- Definition

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.

+ References

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

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-Name Accounting Standards Codification

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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