Employee Benefit Plans - Restricted Stock and Stock Unit Awards (Narrative) (Details) - RSUs shares in Millions, $ in Millions |
12 Months Ended |
|---|---|
|
Feb. 03, 2018
USD ($)
shares
| |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Aggregate intrinsic value expected to vest | $ 266.5 |
| Number of shares expected to vest | shares | 11.9 |
| Unamortized compensation expense | $ 118.4 |
| Unrecognized share based compensation cost, weighted-average period of recognition (in years) | 1 year 11 months |