Receivables (Schedule Of Activity In The Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 81,813	$ 56,675
Provision	35,009	33,429
Charge-offs, recoveries and other	(71,818)	(44,889)
Ending balance	45,004	45,215
EAs
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	26,622	10,123
Provision	18,254	17,682
Charge-offs, recoveries and other	(16,359)	0
Ending balance	28,517	27,805
All Other
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	55,191	46,552
Provision	16,755	15,747
Charge-offs, recoveries and other	(55,459)	(44,889)
Ending balance	$ 16,487	$ 17,410