Impact of New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 28, 2017	Oct. 28, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Discrete tax benefit related to the adoption of ASU 2016-09		$ 1.2
Cumulative effect on retained earnings, tax		0.4
Defined benefit plan, net periodic benefit income excluding service cost	$ 2.5	$ 7.6

Amount of the related income tax effect of a cumulative effect on retained earnings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

Name:	us-gaap_CumulativeEffectOnRetainedEarningsTax1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration