Other Income And Expenses (Schedule Of Other Income And Expenses Of Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Other income (expense), net	$ 6,254	$ 5,249	$ (6,615)
Mortgage Loans [Member]
Other income (expense), net	2,644	4,914	0
Interest Income [Member]
Other income (expense), net	3,642	3,962	272
Investment Securities [Member]
Other income (expense), net	188	8,548	0
Foreign Currency Gain (Loss) [Member]
Other income (expense), net	1	7,807	5,878
Gain (Loss) on Investments [Member]
Other income (expense), net	0	2,500	1,368
Other Nonoperating Expense [Member]
Other income (expense), net	$ 219	$ 1,868	$ (359)