Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	May 04, 2019	May 05, 2018
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 and used	$ 685.0	$ 105.4
Mandatory Purchase Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Expense, Other	$ 0.1