Employee Stock Plans - Restricted Stock Activity (Detail) - Restricted stock - $ / shares shares in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Shares
Beginning balance (in shares)	1,980	2,370	1,365
Granted (in shares)	1,143	483	1,606
Vested (in shares)	(1,006)	(821)	(516)
Forfeited (in shares)	(54)	(52)	(85)
Ending balance (in shares)	2,063	1,980	2,370
Weighted- Average Grant Date Fair Value
Weighted-average, beginning balance (in dollars per share)	$ 40.32	$ 34.34	$ 44.59
Weighted-average, granted (in dollars per share)	49.12	65.05	27.63
Weighted-average, vested (in dollars per share)	37.72	43.76	39.78
Weighted-average, forfeited (in dollars per share)	52.58	34.30	22.35
Weighted-average, ending balance (in dollars per share)	$ 50.12	$ 40.32	$ 34.34