CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2019		101,093,322	11,059,181
Beginning balance at Jan. 31, 2019	$ 252,377	$ 10	$ 1	$ 744,896	$ (319)	$ (492,211)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net (in shares)		5,323,410	100,007
Issuance of common stock upon exercise of stock options and other activity, net	45,732	$ 1		45,731
Issuance of common stock under employee stock purchase plan, net of cancellations (in shares)		322,795
Issuance of common stock under employee stock purchase plan, net of cancellations	18,767			18,767
Issuance of common stock for settlement of RSUs (in shares)		1,716,222
Issuance of common stock for bonus settlement (in shares)		34,600
Issuance of common stock for bonus settlement	2,809			2,809
Issuance of common stock pursuant to charitable donation (in shares)		15,000
Issuance of common stock pursuant to charitable donation	1,746			1,746
Conversion of Class B common stock to Class A common stock (in shares)		2,511,409	(2,511,409)
Equity component of convertible senior notes, net of issuance costs	217,347			217,347
Equity component of early extinguishment of convertible senior notes (in shares)		2,973,311
Equity component of early extinguishment and conversion of convertible senior notes	(26,713)			(26,713)
Proceeds from hedges related to convertible senior notes	405,851			405,851
Payments for warrants related to convertible senior notes	(358,622)			(358,622)
Purchases of capped calls related to convertible senior notes	(74,094)			(74,094)
Stock-based compensation	127,846			127,846
Other comprehensive income	1,211				1,211
Net loss	(208,913)	$ (192,138)	$ (16,775)			(208,913)
Ending balance (in shares) at Jan. 31, 2020		113,990,069	8,647,779
Ending balance at Jan. 31, 2020	405,344	$ 11	$ 1	1,105,564	892	(701,124)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net (in shares)		4,113,825	254,858
Issuance of common stock upon exercise of stock options and other activity, net	45,620	$ 1		45,619
Issuance of common stock under employee stock purchase plan, net of cancellations (in shares)		247,131
Issuance of common stock under employee stock purchase plan, net of cancellations	25,911			25,911
Issuance of common stock for settlement of RSUs (in shares)		2,109,393
Issuance of common stock for bonus settlement (in shares)		85,701
Issuance of common stock for bonus settlement	9,818			9,818
Issuance of common stock pursuant to charitable donation (in shares)		42,500
Issuance of common stock pursuant to charitable donation	9,292			9,292
Conversion of Class B common stock to Class A common stock (in shares)		743,190	(743,190)
Exercise of hedges related to convertible senior notes (in shares)		(167,946)
Equity component of convertible senior notes, net of issuance costs	306,220			306,220
Equity component of early extinguishment of convertible senior notes (in shares)		1,660,104
Equity component of early extinguishment and conversion of convertible senior notes	70,493			70,493
Proceeds from hedges related to convertible senior notes	195,046			195,046
Payments for warrants related to convertible senior notes	(175,399)			(175,399)
Purchases of capped calls related to convertible senior notes	(133,975)			(133,975)
Stock-based compensation	197,507			197,507
Other comprehensive income	4,498				4,498
Net loss	(266,332)	$ (248,892)	$ (17,440)			(266,332)
Ending balance (in shares) at Jan. 31, 2021		122,823,967	8,159,447
Ending balance at Jan. 31, 2021	694,043	$ 12	$ 1	1,656,096	5,390	(967,456)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with business combinations (in shares)		19,190,297
Issuance of common stock in connection with business combinations	$ 5,409,344	$ 2		5,409,342
Stock Issued During Period, Shares, Acquisitions, Subject to Future Vesting		1,269,008
Issuance of common stock upon exercise of stock options and other activity, net (in shares)	2,578,074	2,552,466	1,673
Issuance of common stock upon exercise of stock options and other activity, net	$ 53,535			53,534
Issuance of common stock under employee stock purchase plan, net of cancellations (in shares)		185,707
Issuance of common stock under employee stock purchase plan, net of cancellations	35,568			35,568
Issuance of common stock for settlement of RSUs (in shares)		2,294,313
Issuance of common stock for settlement of RSUs	(13)			(13)
Issuance of common stock pursuant to charitable donation (in shares)		30,000
Issuance of common stock pursuant to charitable donation	7,238			7,238
Conversion of Class B common stock to Class A common stock (in shares)		1,182,628	(1,182,628)
Exercise of hedges related to convertible senior notes (in shares)		(380,088)
Equity component of early extinguishment of convertible senior notes (in shares)		475,915
Equity component of early extinguishment and conversion of convertible senior notes	20,776			20,776
Proceeds from hedges related to convertible senior notes	2			2
Stock-based compensation	567,173			567,173
Other comprehensive income	(17,399)				(17,399)
Net loss	(848,411)	$ (806,276)	$ (42,135)			(848,411)
Ending balance (in shares) at Jan. 31, 2022		149,624,213	6,978,492
Ending balance at Jan. 31, 2022	$ 5,921,856	$ 15	$ 1	$ 7,749,716	$ (12,009)	$ (1,815,867)