Receivables (Schedule Of Activity In The Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 81,813	$ 56,675
Provision	1,617	2,459
Recoveries	(2,475)	0
Charge-offs	(2,155)	(2,831)
Ending balance	78,800	56,303
EAs
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	26,622	10,123
Provision	0	0
Recoveries	0	0
Charge-offs	0	0
Ending balance	26,622	10,123
All Other
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	55,191	46,552
Provision	1,617	2,459
Recoveries	(2,475)	0
Charge-offs	(2,155)	(2,831)
Ending balance	$ 52,178	$ 46,180