Net Loss Per Share Attributable to Ordinary Shareholders - Schedule of Computation of Basic and Diluted Net Loss Per Share Attributable to Ordinary Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Numerator:
Net loss	$ (236,161)	$ (203,848)	$ (129,434)
Denominator:
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders, basic and diluted (in shares)	95,729,844	92,547,145	87,207,094
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders, diluted (in shares)	95,729,844	92,547,145	87,207,094
Net loss per share attributable to ordinary shareholders, diluted (in dollars per share)	$ (2.47)	$ (2.20)	$ (1.48)
Net loss per share attributable to ordinary shareholders, basic (in dollars per share)	$ (2.47)	$ (2.20)	$ (1.48)