Receivables (Schedule Of Activity In The Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 82,480	$ 81,473	$ 81,813
Provision	73,451	76,621	70,569
Charge-offs, recoveries and other	(72,423)	(75,614)	(70,909)
Ending balance	83,508	82,480	81,473
EAs
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	32,034	27,535	26,622
Provision	14,319	21,771	17,272
Charge-offs, recoveries and other	(18,649)	(17,272)	(16,359)
Ending balance	27,704	32,034	27,535
All Other
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	50,446	53,938	55,191
Provision	59,132	54,850	53,297
Charge-offs, recoveries and other	(53,774)	(58,342)	(54,550)
Ending balance	$ 55,804	$ 50,446	$ 53,938