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)		3,863
Issuance of common stock upon exercise of stock options	19,291	$ 1	19,290
Additional Paid-in Capital	118,206		118,206
Vesting of restricted stock units (in shares)						4,327
Vesting of restricted stock units	0					$ 1	$ (1)
Net issuance of restricted stock (in shares)								1,065
Restricted stock settlement, taxes paid	(7,173)		(7,173)
Common stock issued under employee stock purchase plan (in shares)		2,973
Common stock issued under employee stock purchase plan	32,042		32,042
Other comprehensive income (loss)	3,747			3,747
Net loss	(166,354)				(166,354)
Ending balance (in shares) at Jul. 31, 2019		255,752
Ending balance at Jul. 31, 2019	737,539	$ 26	1,982,407	3,409	(1,248,303)
Beginning balance (in shares) at Apr. 30, 2019		252,853
Beginning balance at Apr. 30, 2019	743,976	$ 25	1,924,947	1,289	(1,182,285)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		655
Issuance of common stock upon exercise of stock options	2,502	$ 0	2,502
Additional Paid-in Capital	56,460		56,460
Vesting of restricted stock units (in shares)						2,277
Vesting of restricted stock units						$ 1	(1)
Net issuance of restricted stock (in shares)		33
Restricted stock settlement, taxes paid	(1,501)		(1,501)
Other comprehensive income (loss)	2,120			2,120
Net loss	(66,018)				(66,018)
Ending balance (in shares) at Jul. 31, 2019		255,752
Ending balance at Jul. 31, 2019	737,539	$ 26	1,982,407	3,409	(1,248,303)
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)		4,313
Issuance of common stock upon exercise of stock options	21,626	$ 1	21,625
Additional Paid-in Capital	120,150		120,150
Vesting of restricted stock units (in shares)						5,455
Vesting of restricted stock units						$ 1	(1)
Net issuance of restricted stock (in shares)								(230)
Tax withholding on vesting of restricted stock (in shares)		(219)
Restricted stock settlement, taxes paid	(2,841)		(2,841)
Common stock issued under employee stock purchase plan (in shares)		1,585
Common stock issued under employee stock purchase plan	16,021		16,021
Repurchase of common stock (in shares)		(7,136)
Repurchase of common stock	(90,143)		(90,142)			$ (1)
Other comprehensive income (loss)	6,736			6,736
Net loss	(155,561)				(155,561)
Ending balance (in shares) at Aug. 02, 2020		267,776
Ending balance at Aug. 02, 2020	746,106	$ 27	2,172,391	12,185	(1,438,497)
Beginning balance (in shares) at May. 03, 2020		263,970
Beginning balance at May. 03, 2020	756,858	$ 26	2,120,189	10,173	(1,373,530)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		2,138
Issuance of common stock upon exercise of stock options	12,238	$ 1	12,237
Additional Paid-in Capital	61,456		61,456
Vesting of restricted stock units (in shares)						2,930
Vesting of restricted stock units						$ 1	$ (1)
Tax withholding on vesting of restricted stock (in shares)		(85)
Restricted stock settlement, taxes paid	(1,467)		(1,467)
Repurchase of common stock (in shares)		(1,177)
Repurchase of common stock	(20,024)		(20,023)			$ (1)
Other comprehensive income (loss)	2,012			2,012
Net loss	(64,967)				(64,967)
Ending balance (in shares) at Aug. 02, 2020		267,776
Ending balance at Aug. 02, 2020	$ 746,106	$ 27	$ 2,172,391	$ 12,185	$ (1,438,497)