Employee Stock Plans - Restricted Stock Activity (Detail) - Restricted Stock shares in Thousands	9 Months Ended
	Jan. 31, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Non-vested, beginning balance | shares	2,370
Shares, Granted | shares	481
Shares, Vested | shares	(807)
Shares, Forfeited/expired | shares	(52)
Shares, Non-vested, ending balance | shares	1,992
Weighted-Average Grant Date Fair Value, Non-vested, beginning balance | $ / shares	$ 34.34
Weighted-Average Grant Date Fair Value, Granted | $ / shares	65.07
Weighted-Average Grant Date Fair Value, Vested | $ / shares	43.87
Weighted-Average Grant Date Fair Value, Forfeited/expired | $ / shares	34.30
Weighted-Average Grant Date Fair Value, Non-vested, ending balance | $ / shares	$ 40.29