Share-Based Compensation (Restricted Stock Units Activity) (Details) (USD $) | 3 Months Ended |
2-May-15 | 3-May-14 |
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 | 669,727 | [1] | |
Number of Underlying Shares, Adjustments for performance achievement | 0 | | |
Number of Underlying Shares, Vested | -274,231 | | |
Number of Underlying Shares, Forfeited | -55,265 | | |
Number of Underlying Shares, Ending Balance at May 2, 2015 | 1,906,503 | | |
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 | $20.57 | | |
Adjustments for performance achievement, Weighted-Average Grant Date Fair Value | $0 | | |
Vested, Weighted-Average Grant Date Fair Value | $47.38 | | |
Forfeited, Weighted-Average Grant Date Fair Value | $38.47 | | |
Weighted-Average Grant Date Fair Value, Ending Balance | $30.36 | | |
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 | 113,331 | [1] | |
Number of Underlying Shares, Adjustments for performance achievement | -28,250 | | |
Number of Underlying Shares, Vested | -48,668 | | |
Number of Underlying Shares, Forfeited | -4,875 | | |
Number of Underlying Shares, Ending Balance at May 2, 2015 | 236,958 | | |
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 | $36.21 | | |
Weighted-Average Grant Date Fair Value, Ending Balance | $24.49 | | |
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 | 113,337 | [1] | |
Number of Underlying Shares, Adjustments for performance achievement | 0 | | |
Number of Underlying Shares, Vested | 0 | | |
Number of Underlying Shares, Forfeited | 0 | | |
Number of Underlying Shares, Ending Balance at May 2, 2015 | 149,711 | | |
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 | | |
Vested, Weighted-Average Grant Date Fair Value | $0 | | |
Forfeited, Weighted-Average Grant Date Fair Value | $0 | | |
Weighted-Average Grant Date Fair Value, Ending Balance | $24.16 | | |
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 at 100% of their target vesting amount related to grants of restricted stock units with performance vesting conditions. |