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Plans Fair Value of Plan Assets by Asset Class (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 28, 2013 | Dec. 29, 2012
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Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | $ 428,605 |  | $ 365,671 |
Short Term Investments And Cash |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 5,668 |  | 18,614 |
Equity Securities |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets |  |  | 71,589 | [1]
Equity Securities | Domestic Equity Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 62,705 | [1] |  |
Equity Securities | Us Companies |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 109,017 |  | 72,414 |
Equity Securities | International Companies |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 1,525 |  | 1,532 |
Equity Securities | International Equity Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 67,925 | [2] | 57,428 | [1],[2]
Fixed Income Securities | Domestic Mutual Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 20,187 | [3] | 22,564 | [1],[3]
Fixed Income Securities | Private Equity Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 20,889 | [4] | 24,288 | [4]
Real Estate Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 13,298 | [5] | 11,564 | [5]
Other Investments | Guaranteed Insurance Contracts |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 9,594 | [6] | 9,534 | [6]
Other Investments | Hedge Funds, Equity |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 58,176 | [1],[7] | 34,646 | [7]
Other Investments | Absolute Return Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 59,727 | [4] | 41,936 | [4]
Other Assets And Liabilities |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 484 | [8] | (534) | [8]
Accrued (Expenses) Income |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | (590) | [8] | 96 | [8]
Level 1 |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 193,434 |  | 168,099 |
Level 1 | Equity Securities |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets |  |  | 71,589 | [1]
Level 1 | Equity Securities | Domestic Equity Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 62,705 | [1] |  |
Level 1 | Equity Securities | Us Companies |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 109,017 |  | 72,414 |
Level 1 | Equity Securities | International Companies |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 1,525 |  | 1,532 |
Level 1 | Fixed Income Securities | Domestic Mutual Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 20,187 | [3] | 22,564 | [1],[3]
Level 2 |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 94,482 |  | 100,330 |
Level 2 | Short Term Investments And Cash |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 5,668 |  | 18,614 |
Level 2 | Equity Securities | International Equity Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 67,925 | [2] | 57,428 | [1],[2]
Level 2 | Fixed Income Securities | Private Equity Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 20,889 | [4] | 24,288 | [4]
Level 3 |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 140,689 |  | 97,242 |
Level 3 | Guaranteed Insurance Contracts |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 9,594 |  | 9,534 |
Level 3 | Hedge Funds, Equity |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 58,176 |  | 34,646 |
Level 3 | Absolute Return Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 59,727 |  | 41,936 |
Level 3 | Real Estate Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 13,298 | [5] | 11,564 | [5]
Level 3 | Other Investments | Guaranteed Insurance Contracts |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 9,594 | [6] | 9,534 | [6]
Level 3 | Other Investments | Hedge Funds, Equity |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 58,176 | [1],[7] | 34,646 | [7]
Level 3 | Other Investments | Absolute Return Funds |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 59,727 | [4] | 41,936 | [4]
Level 3 | Other Assets And Liabilities |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | 484 | [8] | (534) | [8]
Level 3 | Accrued (Expenses) Income |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |
Fair value of plan assets | $ (590) | [8] | $ 96 | [8]
[1] | There is a pending sale for an asset in this classification
[2] | This class includes funds with the principal strategy to invest primarily in long positions in international equity securities.
[3] | This class invests primarily in U.S. government issued securities.
[4] | This class invests primarily in absolute return strategy funds.
[5] | This class includes funds that invest primarily in U.S. commercial real estate.
[6] | This class invests primarily guaranteed insurance contracts through various U.S. insurance companies.
[7] | This class invests primarily in hedged equity funds.
[8] | This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.

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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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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