Share-Based Compensation - Unrecognized Compensation Expense and Period for Recognition (Details) - Stock Options [Member] $ in Millions |
12 Months Ended |
|---|---|
|
Jan. 28, 2017
USD ($)
| |
| Unrecognized Compensation Expense and Period for Recognition [Line Items] | |
| Unrecognized share-based compensation expense | $ 2.4 |
| Period for recognition (in years) | 1 year 7 months 20 days |