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Share-Based Compensation (Restricted Stock Units Activity) (Details) - $ / shares
9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target percentage of equity awards earned 100.00%  
Service-based restricted stock units    
Restricted Stock Unit Activity, Number of Underlying Shares    
Number of Underlying Shares, Beginning Balance at January 31, 2015 1,566,272  
Number of Underlying Shares, Granted [1] 1,060,293  
Number of Underlying Shares, Adjustments for performance achievement 0  
Number of Underlying Shares, Vested (437,946)  
Number of Underlying Shares, Forfeited (181,378)  
Number of Underlying Shares, Ending Balance at May 2, 2015 2,007,241  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value    
Weighted-Average Grant Date Fair Value, Beginning Balance $ 37.81  
Granted, Weighted-Average Grant Date Fair Value 20.49  
Adjustments for performance achievement, Weighted-Average Grant Date Fair Value 0.00  
Vested, Weighted-Average Grant Date Fair Value 41.00  
Forfeited, Weighted-Average Grant Date Fair Value 35.62  
Weighted-Average Grant Date Fair Value, Ending Balance $ 28.16  
Performance-based restricted stock units [Member]    
Restricted Stock Unit Activity, Number of Underlying Shares    
Number of Underlying Shares, Beginning Balance at January 31, 2015 205,420  
Number of Underlying Shares, Granted [1] 113,331  
Number of Underlying Shares, Adjustments for performance achievement (28,250)  
Number of Underlying Shares, Vested (48,668)  
Number of Underlying Shares, Forfeited (30,208)  
Number of Underlying Shares, Ending Balance at May 2, 2015 211,625  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value    
Weighted-Average Grant Date Fair Value, Beginning Balance $ 32.05  
Granted, Weighted-Average Grant Date Fair Value 20.10  
Adjustments for performance achievement, Weighted-Average Grant Date Fair Value 36.14  
Vested, Weighted-Average Grant Date Fair Value 38.24  
Forfeited, Weighted-Average Grant Date Fair Value 36.19  
Weighted-Average Grant Date Fair Value, Ending Balance $ 23.09  
Market-based restricted stock units [Member]    
Restricted Stock Unit Activity, Number of Underlying Shares    
Number of Underlying Shares, Beginning Balance at January 31, 2015 36,374  
Number of Underlying Shares, Granted [1] 113,337  
Number of Underlying Shares, Adjustments for performance achievement 0  
Number of Underlying Shares, Vested 0  
Number of Underlying Shares, Forfeited (7,000)  
Number of Underlying Shares, Ending Balance at May 2, 2015 142,711  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value    
Weighted-Average Grant Date Fair Value, Beginning Balance $ 40.13  
Granted, Weighted-Average Grant Date Fair Value 19.04 $ 46.86
Adjustments for performance achievement, Weighted-Average Grant Date Fair Value 0.00  
Vested, Weighted-Average Grant Date Fair Value 0.00  
Forfeited, Weighted-Average Grant Date Fair Value 28.31  
Weighted-Average Grant Date Fair Value, Ending Balance $ 23.96  
Minimum | Performance-based restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target percentage of equity awards earned 0.00%  
Minimum | Market-based restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target percentage of equity awards earned 0.00%  
Maximum | Performance-based restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target percentage of equity awards earned 200.00%  
Maximum | Market-based restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target percentage of equity awards earned 200.00%  
Performance Vesting Conditions    
Restricted Stock Unit Activity, Number of Underlying Shares    
Number of Underlying Shares, Granted 226,668  
[1] Includes 226,668 shares granted at 100% of their target vesting amount related to restricted stock units with performance vesting conditions.