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Employee Benefit Plans Projected Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 26, 2015 | Dec. 27, 2014
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Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 301,244 | $ 326,731
Fair value of plan assets | 266,154 | 281,075
Other Post-Retirement Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 34,911 | 32,246
Fair value of plan assets | $ 0 | $ 0

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- Definition If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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