Income Taxes (Schedule Of Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Unrecognized Tax Benefits [Roll Forward]
Balance, beginning of the year	$ 186,061	$ 149,943	$ 111,514
Additions based on tax positions related to prior years	9,937	6,657	14,743
Reductions based on tax positions related to prior years	(42,647)	(25,259)	(8,469)
Additions based on tax positions related to the current year	38,611	68,292	33,264
Reductions related to settlements with tax authorities	(2,025)	(637)	(293)
Expiration of statute of limitations	(4,793)	(12,936)	(989)
Other	0	1	173
Balance, end of the year	$ 185,144	$ 186,061	$ 149,943

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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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.

+ References

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

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