Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Schedule Of Income Taxes [Line Items]
Undistributed earnings of foreign subsidiaries	$ 571,300,000
Unrecognized tax benefits liability	9,954,000	$ 6,037,000	$ 7,794,000	$ 3,674,000
Unrecognized tax benefits, reductions resulting from resolution	(1,300,000)
Unrecognized tax benefits, interest on income taxes accrued	900,000	600,000	400,000
Unrecognized tax benefits, income tax penalties accrued	500,000	0	0
Recognized interest expense	800,000	$ 200,000	$ 100,000
Internal Revenue Service (IRS)
Schedule Of Income Taxes [Line Items]
Net operating loss carryforward	$ 2,200,000
Net operating loss carryforward, will be fully utilized	2028
State and Local Jurisdiction
Schedule Of Income Taxes [Line Items]
Net operating loss carryforward	$ 40,300,000
Net operating loss carryforward, beginning expiration	2022
Foreign Tax Authority
Schedule Of Income Taxes [Line Items]
Net operating loss carryforward	$ 159,300,000
Net operating loss carryforward, beginning expiration	2022