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Share-Based Compensation (Restricted Stock Units Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 04, 2019
May 05, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 4.0 $ 3.4
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 370,616  
Service-based restricted stock units    
Restricted Stock Unit Activity, Number of Underlying Shares    
Number of Underlying Shares, Beginning Balance at February 3, 2018 2,020,030  
Number of Underlying Shares, Granted 617,986  
Number of Underlying Shares, Adjustments for performance achievement 0  
Number of Underlying Shares, Vested (629,090)  
Number of Underlying Shares, Forfeited (55,590)  
Number of Underlying Shares, Ending Balance at August 4, 2018 [1] 1,953,336  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value    
Weighted-Average Grant Date Fair Value, Beginning Balance at February 3, 2018 $ 16.76  
Weighted-Average Grant Date Fair Value, Granted 23.42  
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement 0.00  
Weighted-Average Grant Date Fair Value, Vested 17.44  
Weighted-Average Grant Date Fair Value, Forfeited 16.12  
Weighted-Average Grant Date Fair Value, Ending Balance at August 4, 2018 $ 18.67  
Performance-based restricted stock units [Member]    
Restricted Stock Unit Activity, Number of Underlying Shares    
Number of Underlying Shares, Beginning Balance at February 3, 2018 801,527  
Number of Underlying Shares, Granted 230,464  
Number of Underlying Shares, Adjustments for performance achievement (90,616)  
Number of Underlying Shares, Vested 0  
Number of Underlying Shares, Forfeited (4,903)  
Number of Underlying Shares, Ending Balance at August 4, 2018 936,472  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value    
Weighted-Average Grant Date Fair Value, Beginning Balance at February 3, 2018 $ 13.65  
Weighted-Average Grant Date Fair Value, Granted 23.05  
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement 24.06  
Weighted-Average Grant Date Fair Value, Vested 0.00  
Weighted-Average Grant Date Fair Value, Forfeited 22.94  
Weighted-Average Grant Date Fair Value, Ending Balance at August 4, 2018 $ 14.88  
Market-based restricted stock units [Member]    
Restricted Stock Unit Activity, Number of Underlying Shares    
Number of Underlying Shares, Beginning Balance at February 3, 2018 435,970  
Number of Underlying Shares, Granted 115,238  
Number of Underlying Shares, Adjustments for performance achievement (72,497)  
Number of Underlying Shares, Vested (18,125)  
Number of Underlying Shares, Forfeited 0  
Number of Underlying Shares, Ending Balance at August 4, 2018 460,586  
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value    
Weighted-Average Grant Date Fair Value, Beginning Balance at February 3, 2018 $ 21.24  
Weighted-Average Grant Date Fair Value, Granted 36.24 $ 33.69
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement 28.20  
Weighted-Average Grant Date Fair Value, Vested 28.20  
Weighted-Average Grant Date Fair Value, Forfeited 0.00  
Weighted-Average Grant Date Fair Value, Ending Balance at August 4, 2018 $ 23.63  
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 370,616 unvested restricted stock units as of May 4, 2019, 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.