Equity Incentive Plans - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	May 02, 2021	May 03, 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)	9,393,611
Vested (in shares)	(3,082,031)
Forfeited (in shares)	(1,829,331)
Unvested, Ending balance (in shares)	35,312,331
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 15.77
Granted (in dollars per share)	22.36
Vested (in dollars per share)	15.61
Forfeited (in dollars per share)	15.65
Ending balance (in dollars per share)	$ 17.53
Aggregate Intrinsic Value	$ 714,015		$ 712,657
Share-based compensation expense	51,600	$ 46,800
Compensation not yet recognized	$ 565,800
Compensation cost (in years)	3 years
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)	120,552
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%