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	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (89,883)	$ (328,352)	$ (525,586)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	563,855	548,022	454,625
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.16)	$ (0.60)	$ (1.16)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	563,855	548,022	454,625
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.16)	$ (0.60)	$ (1.16)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (76,739)	$ (278,950)	$ (423,296)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	481,402	465,569	366,146
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.16)	$ (0.60)	$ (1.16)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	481,402	465,569	366,146
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.16)	$ (0.60)	$ (1.16)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (13,144)	$ (49,402)	$ (102,290)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	82,453	82,453	88,479
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.16)	$ (0.60)	$ (1.16)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	82,453	82,453	88,479
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.16)	$ (0.60)	$ (1.16)