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, 2025	Apr. 30, 2024	Apr. 30, 2023
Numerator
Net loss attributable to common stockholders	$ (288,702)	$ (279,696)	$ (268,839)
Denominator
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	129,089	119,362	109,851
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	129,089	119,362	109,851
Basic and diluted net loss per share attributable to common stockholders
Basic net loss per Class A and B common shares (in dollars per share)	$ (2.24)	$ (2.34)	$ (2.45)
Diluted net loss per Class A and B common shares (in dollars per share)	$ (2.24)	$ (2.34)	$ (2.45)