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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 |

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- Definition Amount of the related income tax effect of a cumulative effect on retained earnings. + References 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 + Details
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