Stockholders' Equity - Summary of Activity for Unvested RSUs and PSUs (Detail) - RSUs and PSUs - $ / shares		3 Months Ended
		Jul. 31, 2022	Jul. 31, 2021
Summary of activity in unvested restricted stock units and performance share units
Restricted Stock Units, RSUs and PSUs outstanding, beginning of period		830,813	995,879
Restricted Stock Units, Awarded	[1]	367,257	243,543
Restricted Stock Units, Vested		(238,444)	(115,763)
Restricted Stock Units, Forfeited		(2,472)	(1,502)
Restricted Stock Units, RSUs and PSUs outstanding, end of period		957,154	1,122,157
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, RSUs and PSUs outstanding, beginning of period		$ 13.30	$ 10.65
Weighted Average Grant Date Fair Value, Awarded	[1]	13.70	16.45
Weighted Average Grant Date Fair Value, Vested		12.72	13.42
Weighted Average Grant Date Fair Value, Forfeited		15.47	12.07
Weighted Average Grant Date Fair Value, RSUs and PSUs outstanding, end of period		$ 13.60	$ 11.62

[1] Includes 28,800 and 43,200 PSUs vested during the three months ended July 31, 2022 and 2021, respectively, in connection with achieving maximum performance targets for the 2019 and 2018 grants, respectively.