Equity Incentive Plans - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 01, 2021	Aug. 02, 2020	Aug. 01, 2021	Aug. 02, 2020	Jan. 31, 2021
Unvested restricted stock units
Number of Restricted Stock Units Outstanding
Unvested, Beginning balance (in shares)			30,830,082
Granted (in shares)			12,888,506
Vested (in shares)			(6,327,142)
Forfeited (in shares)			(2,957,268)
Unvested, Ending balance (in shares)	34,434,178		34,434,178
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)			$ 15.77
Granted (in dollars per share)			21.54
Vested (in dollars per share)			16.58
Forfeited (in dollars per share)			15.83
Ending balance (in dollars per share)	$ 17.74		$ 17.74
Aggregate Intrinsic Value	$ 672,155		$ 672,155		$ 712,657
Share-based compensation expense	59,000	$ 50,100	109,900	$ 96,900
Compensation not yet recognized	$ 559,900		$ 559,900
Compensation cost (in years)			2 years 10 months 24 days
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, target (as a percent)	100.00%
Number of Restricted Stock Units Outstanding
Granted (in shares)	1,115,453		1,236,005
PRSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, target (as a percent)	0.00%
PRSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, target (as a percent)	150.00%