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				6 Months Ended
	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2023	Jul. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (60,361)	$ (31,901)	$ (120,378)	$ (122,561)	$ (92,262)	$ (242,939)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	562,883		546,058		560,422	544,014
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.11)		$ (0.22)		$ (0.16)	$ (0.45)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	562,883		546,058		560,422	544,014
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.11)		$ (0.22)		$ (0.16)	$ (0.45)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (51,519)		$ (102,201)		$ (78,688)	$ (206,118)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	480,430		463,605		477,969	461,561
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.11)		$ (0.22)		$ (0.16)	$ (0.45)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	480,430		463,605		477,969	461,561
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.11)		$ (0.22)		$ (0.16)	$ (0.45)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (8,842)		$ (18,177)		$ (13,574)	$ (36,821)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	82,453		82,453		82,453	82,453
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.11)		$ (0.22)		$ (0.16)	$ (0.45)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	82,453		82,453		82,453	82,453
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.11)		$ (0.22)		$ (0.16)	$ (0.45)