Pension Benefits - Fair Value of Plan Assets (Details) (USD $) | Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012 |
In Thousands, unless otherwise specified |
Level 1 [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | $99,846 | | $112,526 | | |
Level 1 [Member] | U.S. Equity Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 48,640 | | 36,920 | | |
Level 1 [Member] | International Equities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 51,154 | | 75,606 | | |
Level 1 [Member] | Common Collective Funds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | [1] | 0 | [1] | |
Level 1 [Member] | Corporate Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 1 [Member] | US Treasury and Other Government Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 1 [Member] | Group Annuity Contract [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 1 [Member] | Municipal and Provincial Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 1 [Member] | US Government Sponsored Enterprises [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | [2] | 0 | [2] | |
Level 1 [Member] | Other Investments [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 1 [Member] | Cash and Cash Equivalents [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 52 | | 0 | | |
Level 1 [Member] | Private Equity [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 1 [Member] | Hedge Fund [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 2 [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 1,670,383 | | 1,514,703 | | |
Level 2 [Member] | U.S. Equity Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 2 [Member] | International Equities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 2 [Member] | Common Collective Funds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 697,075 | [1] | 581,553 | [1] | |
Level 2 [Member] | Corporate Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 539,098 | | 594,667 | | |
Level 2 [Member] | US Treasury and Other Government Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 150,496 | | 183,700 | | |
Level 2 [Member] | Group Annuity Contract [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 76,290 | | 72,663 | | |
Level 2 [Member] | Municipal and Provincial Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 47,046 | | 41,729 | | |
Level 2 [Member] | US Government Sponsored Enterprises [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 9,517 | [2] | 4,738 | [2] | |
Level 2 [Member] | Other Investments [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 22,951 | | 29,115 | | |
Level 2 [Member] | Cash and Cash Equivalents [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 127,910 | | 6,538 | | |
Level 2 [Member] | Private Equity [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 2 [Member] | Hedge Fund [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 67,021 | | 70,862 | | 62,381 |
Level 3 [Member] | U.S. Equity Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | International Equities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | Common Collective Funds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | [1] | 0 | [1] | |
Level 3 [Member] | Corporate Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | US Treasury and Other Government Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | Group Annuity Contract [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | Municipal and Provincial Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | US Government Sponsored Enterprises [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | [2] | 0 | [2] | |
Level 3 [Member] | Other Investments [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | Cash and Cash Equivalents [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 0 | | 0 | | |
Level 3 [Member] | Private Equity [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 35,727 | | 40,537 | | 36,011 |
Level 3 [Member] | Hedge Fund [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 31,294 | | 30,325 | | |
Estimate of Fair Value Measurement [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 1,837,250 | | 1,698,091 | | |
Estimate of Fair Value Measurement [Member] | U.S. Equity Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 48,640 | | 36,920 | | |
Estimate of Fair Value Measurement [Member] | International Equities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 51,154 | | 75,606 | | |
Estimate of Fair Value Measurement [Member] | Common Collective Funds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 697,075 | [1] | 581,553 | [1] | |
Estimate of Fair Value Measurement [Member] | Corporate Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 539,098 | | 594,667 | | |
Estimate of Fair Value Measurement [Member] | US Treasury and Other Government Securities [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 150,496 | | 183,700 | | |
Estimate of Fair Value Measurement [Member] | Group Annuity Contract [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 76,290 | | 72,663 | | |
Estimate of Fair Value Measurement [Member] | Municipal and Provincial Bonds [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 47,046 | | 41,729 | | |
Estimate of Fair Value Measurement [Member] | US Government Sponsored Enterprises [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 9,517 | [2] | 4,738 | [2] | |
Estimate of Fair Value Measurement [Member] | Other Investments [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 22,951 | | 29,115 | | |
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 127,962 | | 6,538 | | |
Estimate of Fair Value Measurement [Member] | Private Equity [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | 35,727 | | 40,537 | | |
Estimate of Fair Value Measurement [Member] | Hedge Fund [Member] | | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | | |
Assets, fair value disclosure, recurring | $31,294 | | $30,325 | | |
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[1] | The underlying assets of the common/collective funds are primarily comprised of equity and fixed income securities. The fair value in the above table represents our ownership share of the net asset value of the underlying funds. |
[2] | Represents investments that are not backed by the full faith and credit of the United States government. |