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Nature of Operations and Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Non-marketable equity investments (equity method)	$ 18,949us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	$ 19,455us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	$ 17,487us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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