Other Income And Other Expenses (Schedule Of Interest Income And Expense Of Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Other Income and Expenses [Abstract]
Interest income	$ 2,258	$ 699	$ 11,260	$ 3,454
Foreign currency gains (losses), net	33	21	(94)	35
Other income, net		308	109
Other expense, net	(22)			(230)
Other income (expense), net	$ 2,269	$ 1,028	$ 11,275	$ 3,259