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Equity Incentive Plans - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2020
Oct. 31, 2019
Nov. 01, 2020
Oct. 31, 2019
Feb. 02, 2020
Unvested RSUs and PRSUs          
Number of Restricted Stock Units Outstanding          
Unvested, Beginning balance (in shares)     25,434,597    
Granted (in shares)     16,650,722    
Assumed in acquisition (in shares)     2,016,061    
Vested (in shares)     (8,445,201)    
Forfeited (in shares)     (2,308,191)    
Unvested, Ending balance (in shares) 33,347,988   33,347,988    
Weighted-Average Grant Date Fair Value          
Beginning balance (in dollars per share)     $ 18.72    
Granted (in dollars per share)     11.73    
Assumed in acquisition (in dollars per share)     15.79    
Vested (in dollars per share)     16.95    
Forfeited (in dollars per share)     16.94    
Ending balance (in dollars per share) $ 15.62   $ 15.62    
Aggregate Intrinsic Value $ 536,903   $ 536,903   $ 452,736
Share-based compensation expense 50,400 $ 41,000 147,400 $ 118,700  
Compensation not yet recognized $ 476,600   $ 476,600    
Compensation cost (in years)     2 years 9 months 18 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) 179,616   1,631,512    
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) 125.00%