Income Taxes (Schedule Of Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	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