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Equity Incentive Plans - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 02, 2020
Jan. 31, 2019
Jan. 31, 2018
Feb. 02, 2020
Jan. 31, 2019
Weighted-Average Grant Date Fair Value          
Stock-based compensation expense $ 226,705 $ 210,645 $ 150,673    
Unrecognized compensation cost related to stock awards, weighted-average period 1 year 4 months 24 days        
Restricted Stock Units (RSUs)          
Number of RSUs Outstanding          
Unvested, beginning balance (in shares) 21,917,550        
Granted (in shares) 15,780,796        
Vested (in shares) (9,241,583)        
Forfeited (in shares) (3,022,166)        
Unvested, ending balance (in shares) 25,434,597 21,917,550      
Weighted-Average Grant Date Fair Value          
Unvested, beginning balance (in dollars per share) $ 17.94        
Granted (in dollars per share) 18.91        
Vested (in dollars per share) 17.12        
Forfeited (in dollars per share) 18.93        
Unvested, ending balance (in dollars per share) $ 18.72 $ 17.94      
Aggregate Intrinsic Value (in thousands)       $ 452,736 $ 392,515
Stock-based compensation expense $ 161,800 $ 119,900 83,400    
Unrecognized employee compensation cost       $ 435,200  
Unrecognized compensation cost related to stock awards, weighted-average period 3 years        
Awards outstanding (in shares) 25,434,597 21,917,550   25,434,597 21,917,550
Restricted Stock          
Number of RSUs Outstanding          
Unvested, beginning balance (in shares) 2,267,569        
Granted (in shares) 1,399,688        
Vested (in shares) (1,284,638)        
Forfeited (in shares) (255,413)        
Unvested, ending balance (in shares) 2,127,206 2,267,569      
Weighted-Average Grant Date Fair Value          
Unvested, beginning balance (in dollars per share) $ 18.70        
Granted and converted (in dollars per share) 20.30        
Vested (in dollars per share) 18.97        
Forfeited (in dollars per share) 19.93        
Unvested, ending balance (in dollars per share) $ 19.58 $ 18.70      
Aggregate Intrinsic Value (in thousands)       $ 37,864 $ 40,612
Stock-based compensation expense $ 24,600 $ 23,300      
Unrecognized employee compensation cost       $ 14,200  
Unrecognized compensation cost related to stock awards, weighted-average period 1 year 9 months 18 days        
Awards outstanding (in shares) 2,127,206 2,267,569   2,127,206 2,267,569
Total grant date fair value of options vested $ 24,200 $ 3,600      
Performance Vesting Conditions | Restricted Stock          
Number of RSUs Outstanding          
Granted (in shares) 1,399,688        
Earned | Restricted Stock          
Weighted-Average Grant Date Fair Value          
Earned (in shares) 930,678        
Performance Vesting At Maximum | Restricted Stock          
Number of RSUs Outstanding          
Granted (in shares) 1,291,194        
Weighted-Average Grant Date Fair Value          
Award vesting rights, percentage 100.00%        
Performance Vesting At Maximum | Minimum | Restricted Stock          
Weighted-Average Grant Date Fair Value          
Award vesting rights, percentage 0.00%        
Performance Vesting At Maximum | Maximum | Restricted Stock          
Weighted-Average Grant Date Fair Value          
Award vesting rights, percentage 160.00%        
Previously Issued Performance Awards | Restricted Stock          
Number of RSUs Outstanding          
Granted (in shares) 108,494        
Fair value | Restricted Stock Units (RSUs)          
Weighted-Average Grant Date Fair Value          
Unrecognized employee compensation cost     $ 75,500 $ 164,100 $ 184,800