Receivables (Schedule Of Activity In The Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 81,473	$ 81,813
Provision	552	1,617
Charge-offs, recoveries and other	(322)	(4,630)
Ending balance	81,703	78,800
EAs
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	27,535	26,622
Provision	0	0
Charge-offs, recoveries and other	0	0
Ending balance	27,535	26,622
All Other
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	53,938	55,191
Provision	552	1,617
Charge-offs, recoveries and other	(322)	(4,630)
Ending balance	$ 54,168	$ 52,178