Net Loss Per Share - Schedule of Basic And Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net loss attributable to common stockholders	$ (666,704)	$ (311,656)	$ (217,490)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	475,982,265	451,504,377	361,528,119
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	475,982,265	451,504,377	361,528,119
Net loss per share of Class A and Class B common stock attributable to common stockholders:
Net loss per share attributable to common stockholders, basic (in usd per share)	$ (1.40)	$ (0.69)	$ (0.60)
Net loss per share attributable to common stockholders, diluted (in usd per share)	$ (1.40)	$ (0.69)	$ (0.60)
Common Stock Class A
Numerator:
Net loss attributable to common stockholders	$ (431,876)	$ (185,112)	$ (68,620)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	308,330,435	268,177,185	114,064,921
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	308,330,435	268,177,185	114,064,921
Net loss per share of Class A and Class B common stock attributable to common stockholders:
Net loss per share attributable to common stockholders, basic (in usd per share)	$ (1.40)	$ (0.69)	$ (0.60)
Net loss per share attributable to common stockholders, diluted (in usd per share)	$ (1.40)	$ (0.69)	$ (0.60)
Common Stock Class B
Numerator:
Net loss attributable to common stockholders	$ (234,828)	$ (126,544)	$ (148,870)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	167,651,830	183,327,192	247,463,198
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	167,651,830	183,327,192	247,463,198
Net loss per share of Class A and Class B common stock attributable to common stockholders:
Net loss per share attributable to common stockholders, basic (in usd per share)	$ (1.40)	$ (0.69)	$ (0.60)
Net loss per share attributable to common stockholders, diluted (in usd per share)	$ (1.40)	$ (0.69)	$ (0.60)