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Share-Based Compensation (Restricted Stock Units Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 04, 2018
Jul. 29, 2017
Aug. 04, 2018
Jul. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 1.5 $ 0.5 $ 4.9 $ 2.5
Target percentage of equity awards earned     100.00%  
Service-based restricted stock units with $1.00 net income requirement [Member]        
Restricted Stock Unit Activity, Number of Underlying Shares        
Number of Underlying Shares, Ending Balance at August 4, 2018 496,981   496,981  
Service-based restricted stock units        
Restricted Stock Unit Activity, Number of Underlying Shares        
Number of Underlying Shares, Beginning Balance at February 3, 2018     2,520,160  
Number of Underlying Shares, Granted     736,915  
Number of Underlying Shares, Adjustments for performance achievement     0  
Number of Underlying Shares, Vested     (844,382)  
Number of Underlying Shares, Forfeited     (121,568)  
Number of Underlying Shares, Ending Balance at August 4, 2018 [1] 2,291,125   2,291,125  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value        
Weighted-Average Grant Date Fair Value, Beginning Balance at February 3, 2018     $ 15.35  
Weighted-Average Grant Date Fair Value, Granted     21.93  
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement     0.00  
Weighted-Average Grant Date Fair Value, Vested     17.30  
Weighted-Average Grant Date Fair Value, Forfeited     14.88  
Weighted-Average Grant Date Fair Value, Ending Balance at August 4, 2018 $ 16.78   $ 16.78  
Performance-based restricted stock units [Member]        
Restricted Stock Unit Activity, Number of Underlying Shares        
Number of Underlying Shares, Beginning Balance at February 3, 2018     690,174  
Number of Underlying Shares, Granted     197,979  
Number of Underlying Shares, Adjustments for performance achievement     (43,999)  
Number of Underlying Shares, Vested     0  
Number of Underlying Shares, Forfeited     (12,998)  
Number of Underlying Shares, Ending Balance at August 4, 2018 831,156   831,156  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value        
Weighted-Average Grant Date Fair Value, Beginning Balance at February 3, 2018     $ 11.82  
Weighted-Average Grant Date Fair Value, Granted     21.77  
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement     20.10  
Weighted-Average Grant Date Fair Value, Vested     0.00  
Weighted-Average Grant Date Fair Value, Forfeited     12.17  
Weighted-Average Grant Date Fair Value, Ending Balance at August 4, 2018 $ 13.74   $ 13.74  
Market-based restricted stock units [Member]        
Restricted Stock Unit Activity, Number of Underlying Shares        
Number of Underlying Shares, Beginning Balance at February 3, 2018     383,980  
Number of Underlying Shares, Granted     142,014  
Number of Underlying Shares, Adjustments for performance achievement     (36,817)  
Number of Underlying Shares, Vested     (7,185)  
Number of Underlying Shares, Forfeited     (12,999)  
Number of Underlying Shares, Ending Balance at August 4, 2018 468,993   468,993  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value        
Weighted-Average Grant Date Fair Value, Beginning Balance at February 3, 2018     $ 16.50  
Weighted-Average Grant Date Fair Value, Granted     33.69 $ 11.79
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement     19.04  
Weighted-Average Grant Date Fair Value, Vested     19.04  
Weighted-Average Grant Date Fair Value, Forfeited     17.28  
Weighted-Average Grant Date Fair Value, Ending Balance at August 4, 2018 $ 21.45   $ 21.45  
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%  
[1] (1) Includes 496,981 unvested restricted stock units as of August 4, 2018, subject to vesting requirements related to the achievement of certain performance metrics, such as operating income and net income, for the fiscal year immediately preceding the vesting date. Holders of these restricted stock units have the opportunity to earn back one or more installments of the award if the cumulative performance requirements are met in a subsequent year. Unvested shares related to restricted stock units with performance-based and market-based vesting conditions can achieve up to 200% of their target vesting amount and are reflected at 100% of their target vesting amount in the table above.