Net Loss Per Share Attributable To Common Stockholders - Basic and Diluted (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
Numerator:
Net loss	$ (68,595)	$ (30,156)	$ (199,392)	$ (79,732)
Denominator:
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic (in shares)	262,999,535	35,646,513	143,199,215	34,705,426
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	262,999,535	35,646,513	143,199,215	34,705,426
Net loss per share attributable to Class A and Class B common stockholders, basic (in USD per share)	$ (0.26)	$ (0.85)	$ (1.39)	$ (2.30)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in USD per share)	$ (0.26)	$ (0.85)	$ (1.39)	$ (2.30)