Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Numerator
Net loss attributable to common stockholders	$ (56,739)	$ (14,944)	$ (94,198)	$ (14,794)
Class A Common Stock
Denominator
Weighted-average common shares outstanding, basic (in shares)	100,246,000	31,387,000	99,558,000	31,006,000
Weighted-average common shares outstanding, diluted (in shares)	100,246,000	31,387,000	99,558,000	31,006,000
Basic and diluted net loss per share attributable to common stockholders
Net (loss) income per common shares outstanding, basic (in dollars per share)	$ (0.55)	$ (0.39)	$ (0.91)	$ (0.39)
Net (loss) income per common shares outstanding, diluted (in dollars per share)	$ (0.55)	$ (0.39)	$ (0.91)	$ (0.39)
Class A-1 Common Stock
Denominator
Weighted-average common shares outstanding, basic (in shares)	0	6,667,000	0	6,667,000
Weighted-average common shares outstanding, diluted (in shares)	0	6,667,000	0	6,667,000
Basic and diluted net loss per share attributable to common stockholders
Net (loss) income per common shares outstanding, basic (in dollars per share)	$ 0	$ (0.39)	$ 0	$ (0.39)
Net (loss) income per common shares outstanding, diluted (in dollars per share)	$ 0	$ (0.39)	$ 0	$ (0.39)
Class B Common Stock
Denominator
Weighted-average common shares outstanding, basic (in shares)	3,500,000	0	3,500,000	0
Weighted-average common shares outstanding, diluted (in shares)	3,500,000	0	3,500,000	0
Basic and diluted net loss per share attributable to common stockholders
Net (loss) income per common shares outstanding, basic (in dollars per share)	$ (0.55)	$ 0	$ (0.91)	$ 0
Net (loss) income per common shares outstanding, diluted (in dollars per share)	$ (0.55)	$ 0	$ (0.91)	$ 0