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Employee Benefit Plans (Narrative) (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 28, 2013 plan | Dec. 29, 2012 | Dec. 31, 2011 | Jan. 03, 2009 | Dec. 28, 2013 Minimum [Member] | Dec. 28, 2013 Maximum [Member] | Dec. 28, 2013 Hourly 401K Savings Plan [Member] | Dec. 31, 2011 Hourly 401K Savings Plan [Member] | Dec. 28, 2013 Hourly 401K Savings Plan [Member] Minimum [Member] | Dec. 28, 2013 Hourly 401K Savings Plan [Member] Maximum [Member] | Dec. 31, 2011 Hourly 401K Savings Plan [Member] Maximum [Member] | Dec. 28, 2013 Salaried 401(k) Savings Plan [Member] | Dec. 28, 2013 Salaried 401(k) Savings Plan [Member] Minimum [Member] | Dec. 31, 2011 Salaried 401(k) Savings Plan [Member] Minimum [Member] | Dec. 28, 2013 Salaried 401(k) Savings Plan [Member] Maximum [Member] | Dec. 31, 2011 Salaried 401(k) Savings Plan [Member] Maximum [Member] | Dec. 29, 2012 Salary and Hourly 401k Savings Plan [Member] | Dec. 31, 2011 Salary and Hourly 401k Savings Plan [Member] | Dec. 31, 2011 Griffins Defined Contribution Plans [Member] | Dec. 31, 2011 DICI Non-Union Plan [Member] | Dec. 28, 2013 Small Companies [Member] Minimum [Member] | Dec. 28, 2013 Small Companies [Member] Maximum [Member] | Dec. 28, 2013 Fixed Income Securities [Member] | Dec. 29, 2012 Fixed Income Securities [Member] | Dec. 28, 2013 Fixed Income Securities [Member] Domestic | Dec. 28, 2013 Equity Funds [Member] | Dec. 28, 2013 Fixed Income Funds [Member] | Dec. 28, 2013 Equity Securities, International [Member] Emerging Market [Member] | Dec. 28, 2013 Equity Securities [Member] | Dec. 29, 2012 Equity Securities [Member] | Dec. 28, 2013 Equity Securities [Member] Domestic | Dec. 28, 2013 Defined Benefit Plans Assets, Total [Member] Investment [Domain] | Jul. 31, 2005 Central States, Southeast and Southwest Areas Pension Plan [Member] | Dec. 28, 2013 Central States, Southeast and Southwest Areas Pension Plan [Member] | Dec. 29, 2012 Central States, Southeast and Southwest Areas Pension Plan [Member] | Dec. 31, 2011 Central States, Southeast and Southwest Areas Pension Plan [Member]
Employee Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic Pension Plan Benefits Percentage Of The Projected Benefit Obligation | 97.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Contributions | $ 4,000,000 | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent |  |  |  |  |  |  | 25.00% | 100.00% |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Pay Period Maximum Contribution Per Employee, Percent |  |  |  |  |  |  | 6.00% |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent |  |  |  |  |  |  |  |  | 2.00% | 5.00% |  |  | 3.00% | 2.00% | 6.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution Per Pay Period, First Amount Of Participants Deferrals |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Contributions by Plan Participants |  |  |  |  |  |  |  |  |  |  | 520 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount |  |  |  |  |  |  |  | 520 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Employer Contribution Amount | 8,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 | 2,200,000 | 500,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.30% | 38.70% |  | 60.00% | 40.00% |  | 51.70% | 61.30% |  |  |  |  |  |  |  |  |
Period of Return Of Double and Single Digit Returns | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Horizon of Greater Than | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected long-term rate of return on assets | 7.35% | 7.35% | 7.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization, Long-term Debt and Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  | 1.50% |  |  |  |  |  |  |
Investment Objectives Achievement Period |  |  |  |  | 5 years | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiemployer Plan, Contributions To Individual Plan, Percent |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiemployer Plan, Period Contributions | 3,149,000 | 3,200,000 | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 782,000 | [1],[2] | 746,000 | [1],[2] | 705,000 | [1],[2]
Number of Multiemployer Plans, Certified Red Zone | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Multiemployer Plans, Certified Yellow Zone | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiemployer Plan, Withdrawal Obligation | $ 900,000 | $ 1,200,000 |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multiemployer Plans, IRS Extended Amortization Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
[1] | In July 2005 this plan received a 10 year extension from the IRS for amortizing unfunded liabilities.
[2] | The Company has several processing plants that participate in the Central States, Southeast and Southwest Areas Pension Plan under collective bargaining agreements that require minimum funding contributions. Certain of these agreements have expired and are being renegotiated with others having expiration dates through April 30, 2016.

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