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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%

X
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