Receivables (Schedule of Activity in the Allowance For Doubtful Accounts) (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Allowance for Doubtful Accounts [Roll Forward]
Beginning balance	$ 81,473	$ 81,813
Provision	1,890	2,350
Charge-offs, recoveries and other	(1,217)	(4,196)
Ending balance	82,146	79,967
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	1,890	2,350
Charge-offs, recoveries and other	(1,217)	(4,196)
Ending balance	$ 54,611	$ 53,345