Share Incentive Plan - Summary of Information Related to Share Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Jan. 31, 2022	Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options available for grant, beginning balance (in shares)	3,329,614
Beginning balance (in shares)	14,120,179
Options granted (in shares)	721,500
Options exercised and vested (in shares)	(2,232,096)
Options canceled/forfeited (in shares)	(439,482)
Options available for grant, ending balance (in shares)	3,047,596	3,329,614
Ending balance (in shares)	12,170,101	14,120,179
Options vested (in shares)	6,342,760
Options exercisable (in shares)	11,589,567
Weighted-Average Exercise Price
Beginning balance (in US dollars per share)	$ 1.57
Options granted (in US dollars per share)	6.01
Options exercised and vested (in US dollars per share)	0.93
Options canceled/forfeited (in US dollars per share)	2.85
Ending balance (in US dollars per share)	1.90	$ 1.57
Options vested (in US dollars per share)	1.05
Options exercisable (in US dollars per share)	$ 1.91
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value
Weighted-average remaining contractual term, options outstanding	7 years 4 months 2 days	7 years 10 months 13 days
Weighted-average remaining contractual term, options vested	6 years 1 month 28 days
Weighted-average remaining contractual term, options exercisable	7 years 3 months 25 days
Aggregate intrinsic value, options outstanding, beginning balance	$ 62,613
Aggregate intrinsic value, options outstanding, ending balance	124,356	$ 62,613
Aggregate intrinsic value, options vested	70,230
Aggregate intrinsic value, options exercisable	$ 118,280