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, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Other Income and Expenses [Abstract]
Interest income	$ 2,397	$ 2,258	$ 12,648	$ 11,260
Foreign currency gains (losses), net	(139)	33	(25)	(94)
Other, net			1,118	109
Other, net	(379)	(22)
Other income (expense), net	$ 1,879	$ 2,269	$ 13,741	$ 11,275