Receivables (Schedule Of Activity In The Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 81,473	$ 81,813	$ 56,675
Provision	76,621	70,569	74,489
Charge-offs, recoveries and other	(75,614)	(70,909)	(49,351)
Ending balance	82,480	81,473	81,813
EAs
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	27,535	26,622	10,123
Provision	21,771	17,272	16,499
Charge-offs, recoveries and other	(17,272)	(16,359)	0
Ending balance	32,034	27,535	26,622
All Other
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	53,938	55,191	46,552
Provision	54,850	53,297	57,990
Charge-offs, recoveries and other	(58,342)	(54,550)	(49,351)
Ending balance	$ 50,446	$ 53,938	$ 55,191