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, 2023	Jan. 31, 2022	Jan. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (328,352)	$ (525,586)	$ (92,393)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	548,022	454,625	168,255
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.60)	$ (1.16)	$ (0.55)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	548,022	454,625	168,255
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.60)	$ (1.16)	$ (0.55)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (278,950)	$ (423,296)	$ (29,243)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	465,569	366,146	53,253
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.60)	$ (1.16)	$ (0.55)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	465,569	366,146	53,253
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.60)	$ (1.16)	$ (0.55)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (49,402)	$ (102,290)	$ (63,150)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	82,453	88,479	115,002
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.60)	$ (1.16)	$ (0.55)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	82,453	88,479	115,002
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.60)	$ (1.16)	$ (0.55)