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Plans Fair Value of Plan Assets By Asset Class (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets $ 365,671 $ 330,085
Short Term Investments And Cash
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 18,614 21,755
Equity Securities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets   22,557
Equity Securities | Domestic Equity Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 71,589 [1]  
Equity Securities | Us Companies
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 72,414 94,155
Equity Securities | International Companies
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 1,532 1,489
Equity Securities | International Equity Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 57,428 [1],[2] 39,170 [2]
Fixed Income Securities | Domestic Mutual Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 22,564 [1],[3] 39,473 [3]
Fixed Income Securities | Private Equity Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 24,288 [4] 12,721 [4]
Real Estate Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 11,564 [5] 10,381 [5]
Other Investments | Guaranteed Insurance Contracts
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 9,534 [6] 9,413 [6]
Other Investments | Hedge Funds, Equity
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 34,646 [7] 39,099 [7]
Other Investments | Absolute Return Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 41,936 [4] 39,997 [4]
Other Assets And Liabilities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets (534) [8] (322) [8]
Accrued Income
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 96 [8] 197 [8]
Level 1
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 168,099 189,060
Level 1 | Short Term Investments And Cash
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets   21,755
Level 1 | Equity Securities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets   22,557
Level 1 | Equity Securities | Domestic Equity Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 71,589 [1]  
Level 1 | Equity Securities | Us Companies
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 72,414 94,155
Level 1 | Equity Securities | International Companies
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 1,532 1,489
Level 1 | Equity Securities | International Equity Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets   9,631 [2]
Level 1 | Fixed Income Securities | Domestic Mutual Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 22,564 [1],[3] 39,473 [3]
Level 2
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 100,330 42,260
Level 2 | Short Term Investments And Cash
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 18,614  
Level 2 | Equity Securities | International Equity Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 57,428 [1],[2] 29,539 [2]
Level 2 | Fixed Income Securities | Private Equity Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 24,288 [4] 12,721 [4]
Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 97,242 98,765
Level 3 | Guaranteed Insurance Contracts
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 9,534 9,413
Level 3 | Hedge Funds, Equity
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 34,646 39,099
Level 3 | Absolute Return Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 41,936 39,997
Level 3 | Real Estate Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 11,564 [5] 10,381 [5]
Level 3 | Other Investments | Guaranteed Insurance Contracts
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 9,534 [6] 9,413 [6]
Level 3 | Other Investments | Hedge Funds, Equity
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 34,646 [7] 39,099 [7]
Level 3 | Other Investments | Absolute Return Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets 41,936 [4] 39,997 [4]
Level 3 | Other Assets And Liabilities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets (534) [8] (322) [8]
Level 3 | Accrued Income
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets $ 96 [8] $ 197 [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.