Other Income And Other Expenses (Schedule of Other Interest (Expense), net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Other Income and Expenses [Abstract]
Interest income	$ 14,254	$ 16,512	$ 6,861
Foreign currency losses, net	(223)	(233)	(165)
Other, net	1,606	140
Other, net			(642)
Other income (expense), net	$ 15,637	$ 16,419	$ 6,054