Equity Incentive Plans - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Nov. 01, 2020	Oct. 31, 2021	Nov. 01, 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)			14,808,923
Vested (in shares)			(9,875,551)
Forfeited (in shares)			(4,845,679)
Unvested, Ending balance (in shares)	30,917,775		30,917,775
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)			$ 15.77
Granted (in dollars per share)			22.11
Vested (in dollars per share)			16.77
Forfeited (in dollars per share)			16.25
Ending balance (in dollars per share)	$ 18.36		$ 18.36
Aggregate Intrinsic Value	$ 830,451		$ 830,451		$ 712,657
Share-based compensation expense	65,000	$ 50,400	174,900	$ 147,400
Compensation not yet recognized	$ 521,900		$ 521,900
Compensation cost (in years)			2 years 8 months 12 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)	263,995		1,500,000
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%