Net Loss per Share - Schedule of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Earnings Per Share [Abstract]
Net loss attributable to Class A and Class B common stockholders		$ (154,856)	$ (168,889)	$ (547,795)	$ (340,167)
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - basic (in shares)	[1]	303,006,685	166,868,200	297,435,637	93,763,599
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders - diluted (in shares)	[1]	303,006,685	166,868,200	297,435,637	93,763,599
Net loss per share attributable to Class A and Class B common stockholders - basic (in dollars per share)	[1]	$ (0.51)	$ (1.01)	$ (1.84)	$ (3.63)
Net loss per share attributable to Class A and Class B common stockholders - diluted (in dollars per share)	[1]	$ (0.51)	$ (1.01)	$ (1.84)	$ (3.63)

[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.