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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Deferral percentage of base salary     50.00%
Percentage component of compensation allowed as deferral under deferred compensation plan     100.00%
Long-lived assets held for use $ 114.6 $ 96.6  
Performance share units      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Requisite service period     3 years
Minimum [Member] | Performance share units      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pay out percentage     0.00%
Maximum [Member] | Performance share units      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Pay out percentage     200.00%