Net Loss per Share - Schedule of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Earnings Per Share [Abstract]
Net loss attributable to Class A and Class B common stockholders		$ (679,948)	$ (539,102)	$ (348,535)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - basic (in shares)	[1]	300,273,227	141,613,196	44,847,442
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - diluted (in shares)	[1]	300,273,227	141,613,196	44,847,442
Net loss per share attributable to Class A and Class B common stockholders - basic (in dollars per share)	[1]	$ (2.26)	$ (3.81)	$ (7.77)
Net loss per share attributable to Class A and Class B common stockholders - diluted (in dollars per share)	[1]	$ (2.26)	$ (3.81)	$ (7.77)

[1] On March 1, 2021, all shares of the Company’s then-outstanding Class B common stock were automatically converted into the same number of shares of Class A common stock, pursuant to the terms of the Company’s amended and restated certificate of incorporation. No additional shares of Class B common stock will be issued following such conversion. See Note 11 for further details.