Income Taxes (Schedule Of Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Unrecognized Tax Benefits [Roll Forward]
Balance, beginning of the year	$ 185,144	$ 186,061	$ 149,943
Additions based on tax positions related to prior years	1,501	9,937	6,657
Reductions based on tax positions related to prior years	(10,128)	(42,647)	(25,259)
Additions based on tax positions related to the current year	12,093	38,611	68,292
Reductions related to settlements with tax authorities	(980)	(2,025)	(637)
Expiration of statute of limitations	(19,568)	(4,793)	(12,936)
Other	0	0	1
Balance, end of the year	$ 168,062	$ 185,144	$ 186,061