Stock-based Compensation (Schedule of share-based payment award, assumptions) (Details) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jan. 31, 2016 |
Aug. 02, 2015 |
|
| Employee Stock Option [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Risk-free interest rate | 1.68% | |
| Expected dividend yield | 2.46% | |
| Expected volatility | 18.35% | |
| Expected term, years | 6 years | |
| TSR Performance Restricted Stock/Units [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Risk-free interest rate | 0.92% | 0.97% |
| Expected dividend yield | 2.46% | 2.91% |
| Expected volatility | 17.25% | 16.20% |
| Expected term, years | 3 years | 3 years |