Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Aug. 01, 2015	Jan. 31, 2015	Aug. 02, 2014
Fair Value, Inputs, Level 1 [Member]
Significant Accounting Policies [Line Items]
Cash equivalents	$ 40.4	$ 43.1	$ 4.3