v3.8.0.1
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