Consolidated Statements of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Total		Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Restricted Stock Common Stock	Restricted Stock Units	Restricted Stock Units Common Stock	Restricted Stock Units Additional Paid-In Capital
Beginning balance (in shares) at Jan. 31, 2018			220,979
Beginning balance at Jan. 31, 2018	$ 574,401		$ 22	$ 1,479,883	$ (1,917)	$ (903,587)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			9,397
Issuance of common stock upon exercise of stock options	47,750		$ 1	47,749
Stock-based compensation expense	210,645			210,645
Vesting of early exercised stock options	320			320
Vesting of restricted stock units (in shares)									8,378
Vesting of restricted stock units								$ 0	$ 1	$ (1)
Net issuance of restricted stock units ( in shares)							2,398
Tax withholding on vesting of restricted stock	(632)			(632)
Common stock issued under employee stock purchase plan (in shares)			3,381
Common stock issued under employee stock purchase plan	33,444			33,444
Repurchase of common stock (in shares)			(1,009)
Repurchase of common stock	(20,000)			(20,000)
Purchase of capped calls	(64,630)			(64,630)
Equity component of convertible senior notes, net	133,265			133,265
Other comprehensive income (loss)	1,579				1,579
Net loss	(178,362)	[1],[2]				(178,362)
Ending balance (in shares) at Jan. 31, 2019			243,524
Ending balance at Jan. 31, 2019	737,780		$ 24	1,820,043	(338)	(1,081,949)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			7,770
Issuance of common stock upon exercise of stock options	42,931		$ 1	42,930
Stock-based compensation expense	226,705			226,705
Vesting of restricted stock units (in shares)									9,215
Vesting of restricted stock units								0	$ 1	(1)
Net issuance of restricted stock units ( in shares)							624
Tax withholding on vesting of restricted stock	(10,379)			(10,379)
Common stock issued under employee stock purchase plan (in shares)			3,743
Common stock issued under employee stock purchase plan	43,298			43,298
Repurchase of common stock (in shares)			(868)
Repurchase of common stock	(15,017)			(15,017)
Other comprehensive income (loss)	5,787				5,787
Net loss	(200,987)					(200,987)
Ending balance (in shares) at Feb. 02, 2020			264,008
Ending balance at Feb. 02, 2020	830,118		$ 26	2,107,579	5,449	(1,282,936)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			9,734
Issuance of common stock upon exercise of stock options	59,510		$ 1	59,509
Stock-based compensation expense	242,685			242,685
Vesting of restricted stock units (in shares)									11,241
Vesting of restricted stock units								$ 0	$ 1	$ (1)
Cancellation and forfeiture of restricted stock (in shares)							(317)
Tax withholding on vesting of restricted stock (in shares)			(490)
Tax withholding on vesting of restricted stock	(8,258)			(8,258)
Common stock issued under employee stock purchase plan (in shares)			3,714
Common stock issued under employee stock purchase plan	32,439			32,439
Repurchase of common stock (in shares)			(9,527)
Repurchase of common stock	(135,175)			(135,175)
Equity awards assumed in an acquisition	8,802			8,802
Other comprehensive income (loss)	1,961				1,961
Net loss	(282,076)					(282,076)
Ending balance (in shares) at Jan. 31, 2021			278,363
Ending balance at Jan. 31, 2021	$ 750,006		$ 28	$ 2,307,580	$ 7,410	$ (1,565,012)

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