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
	Apr. 30, 2023	Apr. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (31,901)	$ (122,561)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	557,878	541,902
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.06)	$ (0.23)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	557,878	541,902
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.06)	$ (0.23)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (27,186)	$ (103,914)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	475,425	459,449
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.06)	$ (0.23)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	475,425	459,449
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.06)	$ (0.23)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (4,715)	$ (18,647)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	82,453	82,453
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.06)	$ (0.23)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	82,453	82,453
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.06)	$ (0.23)