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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
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.