Receivables (Schedule Of Activity In The Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 81,813	$ 56,675
Provision	2,350	4,238
Recoveries	(3,020)
Charge-offs and other	(1,176)	(4,269)
Ending balance	79,967	56,644
EAs
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	26,622	10,123
Provision	0	0
Recoveries	0
Charge-offs and other	0	0
Ending balance	26,622	10,123
All Other
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	55,191	46,552
Provision	2,350	4,238
Recoveries	(3,020)
Charge-offs and other	(1,176)	(4,269)
Ending balance	$ 53,345	$ 46,521