Impact of New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jul. 29, 2017	Apr. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Discrete tax benefit		$ 1.1	$ 0.2	$ 1.1	$ 0.9
Cumulative effect on retained earnings, tax				0.4
Defined benefit plan, net periodic benefit income excluding service cost	$ 2.7			$ 5.1

Amount of other income tax expense (benefit).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32672-109319

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