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Income Taxes (Schedule Of Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance, beginning of the year | $ 168,062 | $ 185,144 | $ 186,061
Additions based on tax positions related to prior years | 121,364 | 1,501 | 9,937
Reductions based on tax positions related to prior years | (34,470) | (10,128) | (42,647)
Additions based on tax positions related to the current year | 43,800 | 12,093 | 38,611
Reductions related to settlements with tax authorities | (29,362) | (980) | (2,025)
Expiration of statute of limitations | (4,584) | (19,568) | (4,793)
Balance, end of the year | $ 264,810 | $ 168,062 | $ 185,144

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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. + Details
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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 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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