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Pension, Retiree Medical and Savings Plans Retiree Medical Cost Trend Rates (Details) | 12 Months Ended
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Dec. 26, 2015 | Dec. 27, 2014
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year [Abstract] |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year | 6.00% | 6.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 5.00% | 5.00%

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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year [Abstract] + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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