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DEFINED BENEFIT RETIREMENT PLAN (Details2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 25, 2010 | May 12, 2010
--- | --- | --- | ---
Defined benefit retirement plan |  |  |
Fair value pension plans | $ 424,495 | $ 359,636 | $ 351,056
Level 2 member |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 424,495 | 359,636 |
Temporary cash investments |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 1,556 | 1,397 |
Temporary cash investments | Level 2 member |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 1,556 | 1,397 |
Index linked gilts |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 97,422 | 50,803 |
Index linked gilts | Level 2 member |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 97,422 | 50,803 |
Corporate bonds |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 309,206 | 290,303 |
Corporate bonds | Level 2 member |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 309,206 | 290,303 |
Corporate stock |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 16,276 | 16,986 |
Corporate stock | Level 2 member |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 16,276 | 16,986 |
Other investments |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | 35 | 147 |
Other investments | Level 2 member |  |  |
Defined benefit retirement plan |  |  |
Fair value pension plans | $ 35 | $ 147 |

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- Definition 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. + References 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=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=6962843&loc=d3e1928-114920 + Details
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