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, 2023	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net loss	$ (311,656)	$ (217,490)	$ (183,619)
Denominator:
Weighted-average shares used to compute net loss per share, basic	451,504,377	361,528,119	99,660,786
Weighted-average shares used to compute net loss per share, diluted	451,504,377	361,528,119	99,660,786
Net loss per share:
Net loss per share attributable to common stockholders, basic	$ (0.69)	$ (0.60)	$ (1.84)
Net loss per share attributable to common stockholders, diluted	$ (0.69)	$ (0.60)	$ (1.84)
Class A Common Stock [Member]
Numerator:
Net loss	$ (185,112)	$ (68,620)	$ (37,070)
Denominator:
Weighted-average shares used to compute net loss per share, basic	268,177,185	114,064,921	20,121,419
Weighted-average shares used to compute net loss per share, diluted	268,177,185	114,064,921	20,121,419
Net loss per share:
Net loss per share attributable to common stockholders, basic	$ (0.69)	$ (0.60)	$ (1.84)
Net loss per share attributable to common stockholders, diluted	$ (0.69)	$ (0.60)	$ (1.84)
Class B Common Stock [Member]
Numerator:
Net loss	$ (126,544)	$ (148,870)	$ (146,549)
Denominator:
Weighted-average shares used to compute net loss per share, basic	183,327,192	247,463,198	79,539,367
Weighted-average shares used to compute net loss per share, diluted	183,327,192	247,463,198	79,539,367
Net loss per share:
Net loss per share attributable to common stockholders, basic	$ (0.69)	$ (0.60)	$ (1.84)
Net loss per share attributable to common stockholders, diluted	$ (0.69)	$ (0.60)	$ (1.84)