Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Employee Benefit Plans (Summary Of The Fair Value Of Pension Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Defined Benefit Plan Disclosure [Line Items]
Global insurance assets	$ 2,801	$ 3,557	$ 2,339
Global insurance assets
Defined Benefit Plan Disclosure [Line Items]
Global insurance assets	2,801
Global insurance assets \| Quoted Prices In Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Global insurance assets	0
Global insurance assets \| Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Global insurance assets	0
Global insurance assets \| Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Global insurance assets	$ 2,801	$ 3,557