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	Treasury 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)								(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, 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]
Other comprehensive income (loss), net	(3,946)
Net loss	(300,663)	$ (255,266)	$ (45,397)
Ending balance (in shares) at Oct. 31, 2022				469,924	82,453
Ending balance at Oct. 31, 2022	1,859,824			$ 5	$ 1		3,649,474	6,953	(1,796,609)
Beginning balance (in shares) at Apr. 30, 2022				462,430	82,453
Beginning balance at Apr. 30, 2022	1,880,194			$ 4	$ 1		3,488,255	10,441	(1,618,507)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				1,418
Issuance of common stock upon exercise of stock options	1,878						1,878
Issuance of common stock upon settlement of restricted stock units (in shares)				3,183
Issuance of common stock upon settlement of restricted stock units	1			$ 1
Tax withholdings on settlement of restricted stock units (in shares)				(1,040)
Tax withholdings on settlement of restricted stock units	(18,922)						(18,922)
Charitable donation of Class A common stock (in shares)				300
Charitable donation of Class A common stock	5,499						5,499
Shares issued in connection with business acquisition (in shares)				570
Shares issued in connection with business acquisition	2,965						2,965
Issuance of common stock under employee stock purchase plan (in shares)				578
Issuance of common stock under employee stock purchase plan	9,070						9,070
Repurchase of unvested early exercised stock options (in shares)				(441)
Stock-based compensation	88,533						88,533
Other comprehensive income (loss), net	709							709
Net loss	(120,378)								(120,378)
Ending balance (in shares) at Jul. 31, 2022				466,998	82,453
Ending balance at Jul. 31, 2022	1,849,549			$ 5	$ 1		3,577,278	11,150	(1,738,885)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				1,087
Issuance of common stock upon exercise of stock options	2,889						2,889
Issuance of common stock upon settlement of restricted stock units (in shares)				2,790
Tax withholdings on settlement of restricted stock units (in shares)				(951)
Tax withholdings on settlement of restricted stock units	(11,998)						(11,998)
Stock-based compensation	81,305						81,305
Other comprehensive income (loss), net	(4,197)							(4,197)
Net loss	(57,724)	$ (49,073)	$ (8,651)						(57,724)
Ending balance (in shares) at Oct. 31, 2022				469,924	82,453
Ending balance at Oct. 31, 2022	1,859,824			$ 5	$ 1		3,649,474	6,953	(1,796,609)
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
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)								(31,901)
Ending balance (in shares) at Apr. 30, 2023				478,122	82,453
Ending balance at Apr. 30, 2023	1,955,537			$ 5	$ 1		3,801,656	10,074	(1,856,199)
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)	3,559
Repurchase of Class A common stock (in shares)				(3,200)
Charitable donation of Class A common stock (in shares)				300
Other comprehensive income (loss), net	$ (4,454)
Net loss	(123,799)	$ (105,657)	$ (18,142)
Ending balance (in shares) at Oct. 31, 2023		488,021	82,453	488,021	82,453	(3,239)
Ending balance at Oct. 31, 2023	1,961,213			$ 5	$ 1	$ (52,649)	3,958,795	3,158	(1,948,097)
Beginning balance (in shares) at Apr. 30, 2023				478,122	82,453
Beginning balance at Apr. 30, 2023	1,955,537			$ 5	$ 1		3,801,656	10,074	(1,856,199)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				1,824
Issuance of common stock upon exercise of stock options	2,717						2,717
Issuance of common stock upon settlement of restricted stock units (in shares)				5,026
Tax withholdings on settlement of restricted stock units (in shares)				(1,676)
Tax withholdings on settlement of restricted stock units	(27,420)						(27,420)
Issuance of common stock under employee stock purchase plan (in shares)				832
Issuance of common stock under employee stock purchase plan	9,313						9,313
Stock-based compensation	102,148						102,148
Other comprehensive income (loss), net	1,432							1,432
Net loss	(60,361)								(60,361)
Ending balance (in shares) at Jul. 31, 2023				484,128	82,453	0
Ending balance at Jul. 31, 2023	1,983,366			$ 5	$ 1	$ 0	3,888,414	11,506	(1,916,560)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				837
Issuance of common stock upon exercise of stock options	1,516						1,516
Vesting of early exercised stock options	1						1
Issuance of common stock upon settlement of restricted stock units (in shares)				4,639
Tax withholdings on settlement of restricted stock units (in shares)				(1,583)
Tax withholdings on settlement of restricted stock units	(27,047)						(27,047)
Repurchase of Class A common stock (in shares)				(3,200)		(3,239)
Repurchase of Class A common stock	(52,649)					$ (52,649)
Stock-based compensation	95,911						95,911
Other comprehensive income (loss), net	(8,348)							(8,348)
Net loss	(31,537)	$ (26,951)	$ (4,586)						(31,537)
Ending balance (in shares) at Oct. 31, 2023		488,021	82,453	488,021	82,453	(3,239)
Ending balance at Oct. 31, 2023	$ 1,961,213			$ 5	$ 1	$ (52,649)	$ 3,958,795	$ 3,158	$ (1,948,097)