Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 31, 2022	Jul. 31, 2022	Apr. 30, 2022	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Oct. 31, 2022	Oct. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (57,724)	$ (120,378)	$ (122,561)	$ (122,787)	$ (100,026)	$ (239,663)	$ (300,663)	$ (462,476)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	550,164			531,718			546,087	426,811
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.10)			$ (0.23)			$ (0.55)	$ (1.08)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	550,164			531,718			546,087	426,811
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.10)			$ (0.23)			$ (0.55)	$ (1.08)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (49,073)			$ (103,747)			$ (255,266)	$ (364,403)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	467,711			449,265			463,634	336,301
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.10)			$ (0.23)			$ (0.55)	$ (1.08)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	467,711			449,265			463,634	336,301
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.10)			$ (0.23)			$ (0.55)	$ (1.08)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (8,651)			$ (19,040)			$ (45,397)	$ (98,073)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	82,453			82,453			82,453	90,510
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.10)			$ (0.23)			$ (0.55)	$ (1.08)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	82,453			82,453			82,453	90,510
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.10)			$ (0.23)			$ (0.55)	$ (1.08)