Income Taxes - Income (Loss) from Continuing Operations before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Income Tax Disclosure [Abstract]
Domestic	$ 34,661	$ 40,736	$ (22,039)
Foreign	129,039	110,226	156,379
Income before provision for income taxes	$ 163,700	$ 150,962	$ 134,340