Share-Based Compensation - Schedule of Restricted Stock Units, Including Awards with Performance Conditions (Details) - Restricted Stock Units (RSUs) [Member]
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
May 04, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 4 years
Number of Shares  
Unvested at beginning of period (in shares) | shares 3,064
Granted (in shares) | shares 2,386
Vested (in shares) | shares (1,024)
Forfeited (in shares) | shares (453)
Unvested at end of period (in shares) | shares 3,973
Grant Date Weighted Average Fair Value Per Share  
Grant date weighted average fair value at beginning of period (in dollar per share) | $ / shares $ 8.95
Grant date weighted average fair value, granted (in dollar per share) | $ / shares 4.29
Grant date weighted average fair value, vested (in dollar per share) | $ / shares 10.27
Grant date weighted average fair value, forfeited (in dollar per share) | $ / shares 7.39
Grant date weighted average fair value at end of period (in dollar per share) | $ / shares $ 6.00
Fair value of options vested | $ $ 10.5