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, 2022	Apr. 30, 2022	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2022	Jul. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (120,378)	$ (122,561)	$ (100,026)	$ (239,663)	$ (242,939)	$ (339,689)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	546,058		526,512		544,014	373,488
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.22)		$ (0.19)		$ (0.45)	$ (0.91)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	546,058		526,512		544,014	373,488
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.22)		$ (0.19)		$ (0.45)	$ (0.91)
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (102,201)		$ (84,362)		$ (206,118)	$ (253,645)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	463,605		444,059		461,561	278,882
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.22)		$ (0.19)		$ (0.45)	$ (0.91)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	463,605		444,059		461,561	278,882
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.22)		$ (0.19)		$ (0.45)	$ (0.91)
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (18,177)		$ (15,664)		$ (36,821)	$ (86,044)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	82,453		82,453		82,453	94,606
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.22)		$ (0.19)		$ (0.45)	$ (0.91)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	82,453		82,453		82,453	94,606
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.22)		$ (0.19)		$ (0.45)	$ (0.91)