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Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 25, 2011
Dec. 26, 2010
Dec. 27, 2009
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets $ 2,518,515 [1] $ 2,644,352 [1]  
Fair value of pension plan liabilities (128,547) [1] (90,234) [1]  
Cash and other 18,800 [1] 34,610 [1]  
Total net fair value of plan assets 2,408,768 [1] 2,588,728 [1]  
U.S. government-related securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 50,582 [1] 99,454 [1]  
Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 166,922 [1] 83,070 [1]  
Other government bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 39,687 [1] 32,367 [1]  
Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 137,705 [1] 175,306 [1]  
Corporate stock
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 614,975 [1] 678,115 [1]  
Real estate
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 93,620 [1] 90,344 [1]  
Interest in reg. invest. companies
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 112,767 [1] 213,421 [1]  
Interest in 103-12 investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 79,432 [1] 106,947 [1]  
Partnership/joint venture interests
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 128,121 [1] 117,698 [1]  
Hedge funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 232,817 [1] 241,200 [1]  
Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 53,826 [1] 85,245 [1]  
Liability to purchase U.S. government and other securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan liabilities (71,876) [1]    
Derivative liabilities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan liabilities (56,671) [1] (90,234) [1]  
Interest in common/collective trusts | Equities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 434,693 [1] 343,168 [1]  
Interest in common/collective trusts | Fixed Income
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 373,368 [1] 378,017 [1]  
Fair Value, Inputs, Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 731,448 [1] 945,305 [1]  
Fair value of pension plan liabilities (15) [1] (2,521) [1]  
Cash and other 18,135 [1] 12,885 [1]  
Total net fair value of plan assets 749,568 [1] 955,669 [1]  
Fair Value, Inputs, Level 1 | Corporate stock
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 613,976 [1] 676,777 [1]  
Fair Value, Inputs, Level 1 | Interest in reg. invest. companies
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 92,840 [1] 208,023 [1]  
Fair Value, Inputs, Level 1 | Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets   500 [1]  
Fair Value, Inputs, Level 1 | Derivative liabilities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan liabilities (15) [1] (2,521) [1]  
Fair Value, Inputs, Level 1 | Interest in common/collective trusts | Equities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets   461 [1]  
Fair Value, Inputs, Level 1 | Interest in common/collective trusts | Fixed Income
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 24,632 [1] 59,544 [1]  
Fair Value, Inputs, Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 1,404,293 [1] 1,320,130 [1]  
Fair value of pension plan liabilities (126,015) [1] (87,260) [1]  
Cash and other 665 [1] 21,725 [1]  
Total net fair value of plan assets 1,278,943 [1] 1,254,595 [1]  
Fair Value, Inputs, Level 2 | U.S. government-related securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 50,582 [1] 99,454 [1]  
Fair Value, Inputs, Level 2 | Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 165,651 [1] 83,070 [1]  
Fair Value, Inputs, Level 2 | Other government bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 38,246 [1] 30,841 [1]  
Fair Value, Inputs, Level 2 | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 135,635 [1] 169,410 [1]  
Fair Value, Inputs, Level 2 | Corporate stock
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 999 [1] 1,338 [1]  
Fair Value, Inputs, Level 2 | Interest in reg. invest. companies
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 19,927 [1] 5,398 [1]  
Fair Value, Inputs, Level 2 | Interest in 103-12 investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 79,432 [1] 106,947 [1]  
Fair Value, Inputs, Level 2 | Hedge funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 76,801 [1] 77,851 [1]  
Fair Value, Inputs, Level 2 | Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 53,591 [1] 84,641 [1]  
Fair Value, Inputs, Level 2 | Liability to purchase U.S. government and other securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan liabilities (71,876) [1]    
Fair Value, Inputs, Level 2 | Derivative liabilities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan liabilities (54,139) [1] (87,260) [1]  
Fair Value, Inputs, Level 2 | Interest in common/collective trusts | Equities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 434,693 [1] 342,707 [1]  
Fair Value, Inputs, Level 2 | Interest in common/collective trusts | Fixed Income
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 348,736 [1] 318,473 [1]  
Fair Value, Inputs, Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 382,774 [1] 378,917 381,782
Fair value of pension plan liabilities (2,517) [1] (453) [1]  
Total net fair value of plan assets 380,257 [1] 378,464 [1]  
Fair Value, Inputs, Level 3 | Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 1,271 [1]   3,437
Fair Value, Inputs, Level 3 | Other government bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 1,441 [1] 1,526 [1]  
Fair Value, Inputs, Level 3 | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 2,070 [1] 5,896 [1] 15,191
Fair Value, Inputs, Level 3 | Real estate
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 93,620 [1] 90,344 [1] 91,765
Fair Value, Inputs, Level 3 | Partnership/joint venture interests
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 128,121 [1] 117,698 [1] 95,965
Fair Value, Inputs, Level 3 | Hedge funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 156,016 [1] 163,349 [1] 173,559
Fair Value, Inputs, Level 3 | Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan assets 235 [1] 104 [1] 1,865
Fair Value, Inputs, Level 3 | Derivative liabilities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan liabilities $ (2,517) [1] $ (453) [1] $ (3)
[1] The company uses a Dec. 31 measurement date for its retirement plans.