Other Income And Expenses (Schedule Of Other Income And Expenses Of Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Other Nonoperating Income	$ (17,701)	$ (1,314)	$ (36,315)
Other Nonoperating Expense	12,452	7,929	32,410
Mortgage Loans [Member]
Other Nonoperating Income	(4,914)	0	0
Investment Securities [Member]
Other Nonoperating Income	(8,548)	0	(19,918)
Other Interest [Member]
Other Nonoperating Income	(4,239)	(1,314)	(16,397)
Foreign Currency Gain (Loss) [Member]
Other Nonoperating Expense	7,807	5,878	18,191
Gain (Loss) on Investments [Member]
Other Nonoperating Expense	2,500	1,368	12,856
Other Nonoperating Expense [Member]
Other Nonoperating Expense	$ 2,145	$ 683	$ 1,363