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Share-Based Compensation - Schedule of Restricted Stock Units, Including Awards with Performance Conditions (Details) - Restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
May 02, 2020
May 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Number of Shares    
Unvested at beginning of period (in shares) 4,260  
Granted (in shares) 4,548  
Vested (in shares) (802)  
Forfeited (in shares) (247)  
Unvested at end of period (in shares) 7,759  
Grant Date Weighted Average Fair Value Per Share    
Unvested at beginning of period (in USD per share) $ 4.78  
Granted (in USD per share) 1.69  
Vested (in USD per share) 6.95  
Forfeited (in USD per share) 4.98  
Unvested at end of period (in USD per share) $ 2.74  
Fair value of options vested $ 5.6 $ 10.5