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Equity Incentive Plans - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2021
Feb. 02, 2020
Jan. 31, 2019
Jan. 31, 2021
Feb. 02, 2020
Number of RSUs Outstanding          
Granted (in shares) 1,682,266        
Weighted-Average Grant Date Fair Value          
Stock-based compensation expense $ 242,344 $ 226,705 $ 210,645    
Unrecognized compensation cost related to stock awards, weighted-average period 2 years 2 months 12 days        
Restricted Stock Units (RSUs)          
Number of RSUs Outstanding          
Unvested, beginning balance (in shares) 25,434,597        
Granted (in shares) 18,414,274        
Assumed in acquisition (in shares) 2,016,061        
Vested (in shares) (11,240,616)        
Forfeited (in shares) (3,794,234)        
Unvested, ending balance (in shares) 30,830,082 25,434,597      
Weighted-Average Grant Date Fair Value          
Unvested, beginning balance (in dollars per share) $ 18.72        
Granted (in dollars per share) 12.61        
Assumed in acquisition (in dollars per share) 15.79        
Vested (in dollars per share) 16.90        
Forfeited (in dollars per share) 16.82        
Unvested, ending balance (in dollars per share) $ 15.77 $ 18.72      
Aggregate Intrinsic Value (in thousands)       $ 712,657 $ 452,736
Aggregate fair value of awards vested during the period $ 183,400 $ 164,100 184,800    
Stock-based compensation expense $ 199,100 $ 161,800 119,900    
Unrecognized employee compensation cost       $ 428,500  
Unrecognized compensation cost related to stock awards, weighted-average period 2 years 8 months 12 days        
Awards outstanding (in shares) 30,830,082 25,434,597   30,830,082 25,434,597
Performance RSUs          
Weighted-Average Grant Date Fair Value          
Award vesting rights, percentage 100.00%        
Earned (in shares) 1,406,681        
Restricted Stock          
Number of RSUs Outstanding          
Unvested, beginning balance (in shares) 2,127,206        
Vested (in shares) (1,252,405)        
Forfeited (in shares) (316,965)        
Unvested, ending balance (in shares) 557,836 2,127,206      
Weighted-Average Grant Date Fair Value          
Unvested, beginning balance (in dollars per share) $ 19.58        
Vested (in dollars per share) 19.61        
Forfeited (in dollars per share) 20.38        
Unvested, ending balance (in dollars per share) $ 19.06 $ 19.58      
Aggregate Intrinsic Value (in thousands)       $ 12,903 $ 37,864
Aggregate fair value of awards vested during the period $ 18,300 $ 24,200 3,600    
Stock-based compensation expense $ 9,300 $ 24,600 $ 23,300    
Unrecognized employee compensation cost       $ 2,600  
Unrecognized compensation cost related to stock awards, weighted-average period 10 months 24 days        
Awards outstanding (in shares) 557,836 2,127,206   557,836 2,127,206
Minimum | Performance RSUs          
Weighted-Average Grant Date Fair Value          
Award vesting rights, percentage 0.00%        
Maximum | Performance RSUs          
Weighted-Average Grant Date Fair Value          
Award vesting rights, percentage 125.00%