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Employee Benefit Plans (Fair Values of Pension Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 26, 2012 Total [Member] | Dec. 28, 2011 Total [Member] | Dec. 26, 2012 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 Cash Equivalents [Member] Total [Member] | Dec. 28, 2011 Cash Equivalents [Member] Total [Member] | Dec. 26, 2012 Cash Equivalents [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 Cash Equivalents [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 Cash Equivalents [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 Cash Equivalents [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 Cash Equivalents [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 Cash Equivalents [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 Equity Securities [Member] | Dec. 26, 2012 U.S. Large-Cap [Member] Total [Member] | Dec. 28, 2011 U.S. Large-Cap [Member] Total [Member] | Dec. 26, 2012 U.S. Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 U.S. Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 U.S. Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 U.S. Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 U.S. Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 U.S. Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 U.S. Mid-Cap [Member] Total [Member] | Dec. 28, 2011 U.S. Mid-Cap [Member] Total [Member] | Dec. 26, 2012 U.S. Mid-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 U.S. Mid-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 U.S. Mid-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 U.S. Mid-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 U.S. Mid-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 U.S. Mid-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 U.S. Small-Cap [Member] Total [Member] | Dec. 28, 2011 U.S. Small-Cap [Member] Total [Member] | Dec. 26, 2012 U.S. Small-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 U.S. Small-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 U.S. Small-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 U.S. Small-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 U.S. Small-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 U.S. Small-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 International Large-Cap [Member] Total [Member] | Dec. 28, 2011 International Large-Cap [Member] Total [Member] | Dec. 26, 2012 International Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 International Large-Cap [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 International Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 International Large-Cap [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 International Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 International Large-Cap [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 Fixed Income Securities [Member] | Dec. 26, 2012 U.S. Treasuries [Member] Total [Member] | Dec. 28, 2011 U.S. Treasuries [Member] Total [Member] | Dec. 26, 2012 U.S. Treasuries [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 U.S. Treasuries [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 U.S. Treasuries [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 U.S. Treasuries [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 U.S. Treasuries [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 U.S. Treasuries [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 Corporate Bonds [Member] Total [Member] | Dec. 28, 2011 Corporate Bonds [Member] Total [Member] | Dec. 26, 2012 Corporate Bonds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 Corporate Bonds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 Corporate Bonds [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 Corporate Bonds [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 Corporate Bonds [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 Corporate Bonds [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 26, 2012 Commingled Funds [Member] Total [Member] | Dec. 28, 2011 Commingled Funds [Member] Total [Member] | Dec. 26, 2012 Commingled Funds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 28, 2011 Commingled Funds [Member] Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Dec. 26, 2012 Commingled Funds [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 28, 2011 Commingled Funds [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 26, 2012 Commingled Funds [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 28, 2011 Commingled Funds [Member] Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strategic target asset allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets | $ 58,006 | $ 53,270 | $ 54,354 | $ 49,900 | $ 3,652 | $ 3,370 | $ 0 | $ 0 | $ 873 | $ 611 | $ 873 | $ 611 | $ 0 | $ 0 | $ 0 | $ 0 |  | $ 15,569 | [1] | $ 14,208 | [1] | $ 15,569 | [1] | $ 14,208 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 4,702 | [2] | $ 4,371 | [2] | $ 4,702 | [2] | $ 4,371 | [2] | $ 0 | [2] | $ 0 | [2] | $ 0 | [2] | $ 0 | [2] | $ 1,157 | [3] | $ 1,046 | [3] | $ 1,157 | [3] | $ 1,046 | [3] | $ 0 | [3] | $ 0 | [3] | $ 0 | [3] | $ 0 | [3] | $ 9,292 | $ 8,440 | $ 9,292 | $ 8,440 | $ 0 | $ 0 | $ 0 | $ 0 |  | $ 2,582 | $ 2,375 | $ 2,582 | $ 2,375 | $ 0 | $ 0 | $ 0 | $ 0 | $ 20,179 | [4] | $ 18,849 | [4] | $ 20,179 | [4] | $ 18,849 | [4] | $ 0 | [4] | $ 0 | [4] | $ 0 | [4] | $ 0 | [4] | $ 3,652 | [5] | $ 3,370 | [5] | $ 0 | [5] | $ 0 | [5] | $ 3,652 | [5] | $ 3,370 | [5] | $ 0 | [5] | $ 0 | [5]
[1] | The majority of this category represents a fund with the objective of approximating the return of the S&P 500 Index. The remaining securities include both a large-value fund and a large-growth fund investing in diverse industries.
[2] | This category includes both a mid-growth fund with the objective of outperforming the Russell Mid Cap Growth Index and a mid-value fund investing in diverse industries.
[3] | This category includes both a small-value fund and a small-growth fund investing in diverse industries.
[4] | This category includes intermediate and long-term investment grade bonds from diverse industries.
[5] | This category represents a fund of well diversified mutual funds with the objective of providing a low-volatility means to access equity-like returns.

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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 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 3: 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 4: 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 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=21915506&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + 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 (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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