Employee Benefit Plans - Option Plan and Stock Award Activity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Feb. 03, 2018 |
Jan. 28, 2017 |
Jan. 30, 2016 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Options vested and expected to vest, aggregate intrinsic value | $ 118.6 | ||
| Options exercisable, aggregate intrinsic value | 84.5 | ||
| Aggregate intrinsic value of stock options exercised | $ 57.0 | $ 19.8 | $ 9.7 |
| Closing stock price (in usd per share) | $ 22.43 | ||
| Unamortized compensation expense for stock options | $ 4.5 | ||
| Stock Options | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Unrecognized share based compensation cost, weighted-average period of recognition (in years) | 11 months | ||