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Share-Based Compensation (Restricted Stock Units Assumptions) (Details) - Market-based restricted stock units [Member]
3 Months Ended
Apr. 29, 2017
$ / shares
Apr. 30, 2016
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date market price (in dollars per share) $ 11.43 $ 31.67
Fair value (in dollars per share) $ 11.79 $ 38.22
Price volatility 47.00% 44.00%
Expected term (years) 2 years 10 months 24 days 2 years 9 months 18 days
Risk-free interest rate 1.50% 1.10%
Dividend yield 7.00% 2.50%
Average volatility of peer companies 35.20% 34.40%
Average correlation coefficient of peer companies 0.2664 0.3382