Income Taxes (Schedule Of Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Unrecognized Tax Benefits [Roll Forward]
Balance, beginning of the year	$ 86,268	$ 111,491	$ 146,391
Additions based on tax positions related to prior years	29,294	15,510	9,743
Reductions based on tax positions related to prior years	(25,413)	(38,783)	(25,403)
Additions based on tax positions related to the current year	27,220	22,319	7,399
Reductions related to settlements with tax authorities	(450)	(10,450)	(23,993)
Expiration of statute of limitations	(8,922)	(11,423)	(11,853)
Other	(3,517)	2,396	(9,207)
Balance, end of the year	$ 111,514	$ 86,268	$ 111,491

Gross amount of decreases in unrecognized tax benefits resulting from other.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

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