Net Income (Loss) Per Share - Schedule of Net Loss Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Numerator:
Net income (loss)	$ (22,176)	$ (27,511)	$ 1,329
Undistributed earnings attributable to participating securities	0	0	(1,329)
Net loss attributable to ordinary shareholders	$ (22,176)	$ (27,511)	$ 0
Denominators:
Weighted-average shares outstanding used in basic calculation (in shares)	88,398	69,099	71,728
Weighted-average shares outstanding used in diluted calculation (in shares)	88,398	69,099	71,728
Net loss per share attributable to ordinary shareholders:
Net loss per share, basic (in US dollars per share)	$ (0.25)	$ (0.40)	$ 0
Net loss per share, diluted (in US dollars per share)	$ (0.25)	$ (0.40)	$ 0