Employee Stock Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Apr. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments of tax withholdings on restricted stock	$ 16,625	$ 10,175
Shares repurchased during the period, value	$ 40,113	$ 14,358
Treasury Stock, Common
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased during the period (in shares)	351,250	90,000
Shares repurchased during the period, value	$ 23,500	$ 4,200
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees stock purchased (in shares)	70,309	105,311
Employees stock purchased, price per share (in usd per share)	$ 60.43	$ 44.59
Shares available for future issuance (in shares)	1,500,000
Market Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	800,000
Total unrecognized compensation cost related to non-vested awards	$ 39,200
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	1,949,000		1,974,000
Total unrecognized compensation cost related to non-vested awards	$ 101,100
Expected cost recognized over weighted-average period	2 years 9 months 18 days
Shares repurchased during the period to pay for taxes (in shares)	252,622	201,441
Payments of tax withholdings on restricted stock	$ 16,600	$ 10,200