Income Taxes - Schedule of loss before provision for (benefit from) income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Domestic	$ (292,730)	$ (221,212)	$ (183,619)
Foreign	(21,698)	242	0
Loss before income taxes	$ (314,428)	$ (220,970)	$ (183,619)