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Equity Incentive Plans - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Feb. 02, 2020	Jan. 31, 2019	Jan. 31, 2018	Oct. 31, 2019	Apr. 04, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 226,705	$ 210,645	$ 150,673
Number of options granted, net of cancellations (in shares)	0	0
Unrecognized compensation cost related to stock awards, weighted-average period	1 year 4 months 24 days
Shares underlying outstanding equity awards (in shares)	26,822,243	35,465,543
Common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing price of stock (in dollars per share)	$ 17.80			$ 17.80	$ 19.83
Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of exercised options	$ 106,600	$ 165,000	104,900
Stock-based compensation expense	15,800	32,000	$ 49,000
Weighted-average grant date fair value of options granted (in dollars per share)			$ 5.57
Total grant date fair value of options vested	34,200	45,600	$ 42,500
Unrecognized compensation cost	11,000
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 161,800	$ 119,900	$ 83,400
Unrecognized compensation cost related to stock awards, weighted-average period	3 years