Summary of Significant Accounting Policies (Stock-based Compensation) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
Mar. 31, 2012	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Accounting Policies [Abstract]
Stock-based compensation expense		$ 5.9	$ 10.1	$ 12.3
Expenses on date of modification	$ 5.3	$ 5.4

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration