Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2022				458,773	82,453
Beginning balance at Jan. 31, 2022	$ 1,921,917			$ 4	$ 1	$ 3,406,959	$ 10,899	$ (1,495,946)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				1,283
Issuance of common stock upon exercise of stock options	2,683					2,683
Vesting of early exercised stock options	1,355					1,355
Issuance of common stock upon settlement of restricted stock units (in shares)				3,499
Tax withholdings on settlement of restricted stock units (in shares)				(1,125)
Tax withholdings on settlement of restricted stock units	(24,827)					(24,827)
Stock-based compensation	102,085					102,085
Other comprehensive income (loss), net	(458)						(458)
Net loss	(122,561)	$ (103,914)	$ (18,647)					(122,561)
Ending balance (in shares) at Apr. 30, 2022				462,430	82,453
Ending balance at Apr. 30, 2022	1,880,194			$ 4	$ 1	3,488,255	10,441	(1,618,507)
Beginning balance (in shares) at Jan. 31, 2023		474,160	82,453	474,160	82,453
Beginning balance at Jan. 31, 2023	$ 1,920,158			$ 5	$ 1	3,736,838	7,612	(1,824,298)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	898			898
Issuance of common stock upon exercise of stock options	$ 1,175					1,175
Issuance of common stock upon settlement of restricted stock units (in shares)				4,246
Tax withholdings on settlement of restricted stock units (in shares)				(1,463)
Tax withholdings on settlement of restricted stock units	(25,697)					(25,697)
Charitable donation of Class A common stock (in shares)				281
Charitable donation of Class A common stock	4,215					4,215
Stock-based compensation	85,125					85,125
Other comprehensive income (loss), net	2,462						2,462
Net loss	(31,901)	$ (27,186)	$ (4,715)					(31,901)
Ending balance (in shares) at Apr. 30, 2023		478,122	82,453	478,122	82,453
Ending balance at Apr. 30, 2023	$ 1,955,537			$ 5	$ 1	$ 3,801,656	$ 10,074	$ (1,856,199)