Equity Incentive Plans - Equity Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Aug. 02, 2020	May 03, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019	Feb. 02, 2020
Options Outstanding, Number of Shares
Beginning balance (in shares)		26,822,243		26,822,243
Options exercised (in shares)				(4,312,894)
Options forfeited (in shares)				(125,685)
Ending balance (in shares)	22,383,664			22,383,664
Vested and exercisable (in shares)	20,369,881			20,369,881
Options Outstanding, Weighted Average Exercise Price
Beginning balance (in dollars per share)		$ 8.97		$ 8.97
Options exercised (in dollars per share)				5.01
Options forfeited/canceled (in dollars per share)				16.54
Ending balance (in dollars per share)	$ 9.70			9.70
Weighted Average Exercise Price, Vested and exercisable (in dollars per share)	$ 9.06			$ 9.06
Weighted- Average Remaining Contractual Life
Weighted Average Remaining Contractual Life (in years)		3 years 10 months 24 days		4 years 2 months 12 days
Weighted Average Remaining Contractual Life, Vested and exercisable (in years)				4 years 1 month 6 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 183,708			$ 183,708		$ 237,803
Aggregate Intrinsic Value, Vested and exercisable	$ 179,477			$ 179,477
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of stock (in dollars per share)	$ 17.86			$ 17.86
Total stock-based compensation expense	$ 61,452		$ 58,404	$ 120,146	$ 120,561
Unrecognized compensation cost, stock options	6,400			$ 6,400
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)				4 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 4,500		$ 2,100	$ 4,100	$ 10,000
Compensation cost (in years)				1 year
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of stock (in dollars per share)	$ 17.86			$ 17.86