Condensed 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 Units Common Stock	Restricted Stock Units Additional Paid-in Capital	Restricted Stock Common Stock
Beginning balance (in shares) at Jan. 31, 2019		243,524
Beginning 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)		4,797
Issuance of common stock upon exercise of stock options	26,006	$ 1	26,005
Stock-based compensation expense	170,542		170,542
Vesting of restricted stock units (in shares)						6,884
Vesting of restricted stock units	0					$ 1	$ (1)
Net issuance of restricted stock (in shares)								972
Tax withholding on vesting of restricted stock	(8,787)		(8,787)
Common stock issued under employee stock purchase plan (in shares)		3,743
Common stock issued under employee stock purchase plan	43,291		43,291
Other comprehensive income (loss)	5,454			5,454
Net loss	(196,336)				(196,336)
Ending balance (in shares) at Oct. 31, 2019		259,920
Ending balance at Oct. 31, 2019	777,950	$ 26	2,051,093	5,116	(1,278,285)
Beginning balance (in shares) at Jul. 31, 2019		255,752
Beginning balance at Jul. 31, 2019	737,539	$ 26	1,982,407	3,409	(1,248,303)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		934
Issuance of common stock upon exercise of stock options	6,715	$ 0	6,715
Stock-based compensation expense	52,336		52,336
Vesting of restricted stock units (in shares)						2,557
Vesting of restricted stock units						$ 0	0
Net issuance of restricted stock (in shares)		(93)
Tax withholding on vesting of restricted stock	(1,614)		(1,614)
Common stock issued under employee stock purchase plan (in shares)		770
Common stock issued under employee stock purchase plan	11,249		11,249
Other comprehensive income (loss)	1,707			1,707
Net loss	(29,982)				(29,982)
Ending balance (in shares) at Oct. 31, 2019		259,920
Ending balance at Oct. 31, 2019	777,950	$ 26	2,051,093	5,116	(1,278,285)
Beginning balance (in shares) at Feb. 02, 2020		264,008
Beginning 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)		4,991
Issuance of common stock upon exercise of stock options	25,645	$ 1	25,644
Stock-based compensation expense	179,884		179,884
Vesting of restricted stock units (in shares)						8,445
Vesting of restricted stock units						$ 1	(1)
Tax withholding on vesting of restricted stock (in shares)								305
Tax withholding on vesting of restricted stock	(4,080)		(4,080)
Cancellation and forfeiture of restricted stock (in shares)		317
Cancellation and forfeiture of restricted stock	0		0
Common stock issued under employee stock purchase plan (in shares)		3,714
Common stock issued under employee stock purchase plan	32,439		32,439
Repurchases of common stock (in shares)		(8,496)
Repurchases of common stock	(111,554)	$ (1)	(111,553)
Equity awards assumed in an acquisition	8,802		8,802
Other comprehensive income (loss)	3,610			3,610
Net loss	(229,783)				(229,783)
Ending balance (in shares) at Nov. 01, 2020		272,040
Ending balance at Nov. 01, 2020	735,081	$ 27	2,238,714	9,059	(1,512,719)
Beginning balance (in shares) at Aug. 02, 2020		267,776
Beginning balance at Aug. 02, 2020	746,106	$ 27	2,172,391	12,185	(1,438,497)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		678
Issuance of common stock upon exercise of stock options	4,019	$ 0	4,019
Stock-based compensation expense	59,734		59,734
Vesting of restricted stock units (in shares)						2,990
Vesting of restricted stock units						$ 0	$ 0
Tax withholding on vesting of restricted stock (in shares)								(86)
Tax withholding on vesting of restricted stock	(1,239)		(1,239)
Cancellation and forfeiture of restricted stock (in shares)								(87)
Common stock issued under employee stock purchase plan (in shares)		2,129
Common stock issued under employee stock purchase plan	16,418		16,418
Repurchases of common stock (in shares)		(1,360)
Repurchases of common stock	(21,411)	$ 0	(21,411)
Equity awards assumed in an acquisition	8,802		8,802
Other comprehensive income (loss)	(3,126)			(3,126)
Net loss	(74,222)				(74,222)
Ending balance (in shares) at Nov. 01, 2020		272,040
Ending balance at Nov. 01, 2020	$ 735,081	$ 27	$ 2,238,714	$ 9,059	$ (1,512,719)