Other Income And Other Expenses (Schedule Of Interest Income And Expense Of Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Other Income and Expenses [Abstract]
Interest income	$ 4,505	$ 1,311	$ 9,002	$ 2,755
Foreign currency gains (losses), net	(124)	(117)	(127)	14
Other income, net	83		131
Other expense, net		(183)		(538)
Other income (expense), net	$ 4,464	$ 1,011	$ 9,006	$ 2,231