Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Current
Federal	$ 27,171	$ 12,537	$ 11,858
Foreign	9,098	1,624	13,739
State	5,594	7,857	5,929
Total Current	41,863	22,018	31,526
Deferred
Federal	(4,653)	8,986	453
Foreign	(5,870)	(7,347)	(16,931)
State	194	(713)	(1,009)
Total Deferred	(10,329)	926	(17,487)
Total provision for income taxes	$ 31,534	$ 22,944	$ 14,039