Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Numerator
Net loss attributable to common stockholders	$ (192,065)	$ (55,696)	$ (69,378)
Class A Common Stock
Denominator
Basic weighted-average common shares outstanding (in shares)	100,904	56,678	29,133
Diluted weighted-average common shares outstanding (in shares)	100,904	56,678	29,133
Basic and diluted net loss per share attributable to common stockholders
Basic net loss per common shares outstanding (in dollars per share)	$ (1.84)	$ (0.90)	$ (1.94)
Diluted net loss per common shares outstanding (in dollars per share)	$ (1.84)	$ (0.90)	$ (1.94)
Redeemable Convertible Common Class A-1 Stock
Denominator
Basic weighted-average common shares outstanding (in shares)	0	6,667	6,667
Diluted weighted-average common shares outstanding (in shares)	0	6,667	6,667
Basic and diluted net loss per share attributable to common stockholders
Basic net loss per common shares outstanding (in dollars per share)	$ 0	$ (0.55)	$ (1.94)
Diluted net loss per common shares outstanding (in dollars per share)	$ 0	$ (0.55)	$ (1.94)
Class B Common Stock
Denominator
Basic weighted-average common shares outstanding (in shares)	3,500	3,500	0
Diluted weighted-average common shares outstanding (in shares)	3,500	3,500	0
Basic and diluted net loss per share attributable to common stockholders
Basic net loss per common shares outstanding (in dollars per share)	$ (1.84)	$ (0.35)	$ 0
Diluted net loss per common shares outstanding (in dollars per share)	$ (1.84)	$ (0.35)	$ 0