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Fair Value of Pension Plan Assets by Level within Fair Value Hierarchy (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only $ 2,978,584 [1] $ 2,594,250 [1]  
Fair value of pension plan liabilities (11,502) [1] (85,250) [1]  
Cash and other 61,385 [1] 43,316 [1]  
Fair value of pension plan assets 3,028,467 [1] 2,552,316 [1]  
U.S. government-related securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 3,313 [1] 100,140 [1]  
Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 3,975 [1] 71,641 [1]  
Other government bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 72,748 [1] 30,317 [1]  
Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 31,087 [1] 137,437 [1]  
Corporate stock
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 1,051,550 [1] 723,437 [1]  
Real estate
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 98,909 [1] 97,385 [1]  
Equities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 750,006 [1] 604,003 [1]  
Fixed Income
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 145,897 [1] 193,620 [1]  
Interest in reg. invest. companies
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 323,639 [1] 128,418 [1]  
Interest in 103-12 investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 28,691 [1] 84,956 [1]  
Partnership/joint venture interests
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 184,952 [1] 130,995 [1]  
Hedge funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 272,676 [1] 236,444 [1]  
Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 11,141 [1] 55,457 [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   (26,882) [1]  
Derivative liabilities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of pension plan liabilities (11,502) [1] (58,368) [1]  
Fair Value, Inputs, Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 1,173,934 [1] 826,848 [1]  
Fair value of pension plan liabilities (8) [1] (21) [1]  
Cash and other 60,271 [1] 36,295 [1]  
Fair value of pension plan assets 1,234,197 [1] 863,122 [1]  
Fair Value, Inputs, Level 1 | U.S. government-related securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Other government bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Corporate stock
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 892,883 [1] 722,619 [1]  
Fair Value, Inputs, Level 1 | Real estate
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Equities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Fixed Income
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Interest in reg. invest. companies
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 281,029 [1] 104,196 [1]  
Fair Value, Inputs, Level 1 | Interest in 103-12 investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Partnership/joint venture interests
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Hedge funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 1 | Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 22 [1] 33 [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 (8) [1] (21) [1]  
Fair Value, Inputs, Level 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   0 [1]  
Fair Value, Inputs, Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 1,305,784 [1] 1,378,801 [1]  
Fair value of pension plan liabilities (9,486) [1] (83,221) [1]  
Cash and other 1,114 [1] 7,021 [1]  
Fair value of pension plan assets 1,297,412 [1] 1,302,601 [1]  
Fair Value, Inputs, Level 2 | U.S. government-related securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 3,313 [1] 100,140 [1]  
Fair Value, Inputs, Level 2 | Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 3,975 [1] 71,641 [1]  
Fair Value, Inputs, Level 2 | Other government bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 72,748 [1] 30,317 [1]  
Fair Value, Inputs, Level 2 | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 29,834 [1] 136,640 [1]  
Fair Value, Inputs, Level 2 | Corporate stock
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 158,667 [1] 818 [1]  
Fair Value, Inputs, Level 2 | Real estate
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 2 | Equities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 750,006 [1] 604,003 [1]  
Fair Value, Inputs, Level 2 | Fixed Income
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 145,897 [1] 193,620 [1]  
Fair Value, Inputs, Level 2 | Interest in reg. invest. companies
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 42,610 [1] 24,222 [1]  
Fair Value, Inputs, Level 2 | Interest in 103-12 investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 28,691 [1] 84,956 [1]  
Fair Value, Inputs, Level 2 | Partnership/joint venture interests
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 36,402 [1] 0 [1]  
Fair Value, Inputs, Level 2 | Hedge funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 22,685 [1] 77,520 [1]  
Fair Value, Inputs, Level 2 | Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 10,956 [1] 54,924 [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 (9,486) [1] (56,339) [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   (26,882) [1]  
Fair Value, Inputs, Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 498,866 [1] 388,601 [1] 382,774
Fair value of pension plan liabilities (2,008) [1] (2,008) [1]  
Cash and other 0 [1] 0 [1]  
Fair value of pension plan assets 496,858 [1] 386,593 [1]  
Fair Value, Inputs, Level 3 | U.S. government-related securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 3 | Mortgage Backed Securities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1] 1,271
Fair Value, Inputs, Level 3 | Other government bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1] 1,441
Fair Value, Inputs, Level 3 | Corporate bonds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 1,253 [1] 797 [1] 2,070
Fair Value, Inputs, Level 3 | Corporate stock
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 3 | Real estate
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 98,909 [1] 97,385 [1] 93,620
Fair Value, Inputs, Level 3 | Equities
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 3 | Fixed Income
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 3 | Interest in reg. invest. companies
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 3 | Interest in 103-12 investments
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1]  
Fair Value, Inputs, Level 3 | Partnership/joint venture interests
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 148,550 [1] 130,995 [1] 128,121
Fair Value, Inputs, Level 3 | Hedge funds
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 249,991 [1] 158,924 [1] 156,016
Fair Value, Inputs, Level 3 | Derivative contracts
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 163 [1] 500 [1] 235
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 (2,008) [1] (2,008) [1]  
Fair Value, Inputs, Level 3 | 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   0 [1]  
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 $ (2,008) $ (2,008) $ (2,517)
[1] The company uses a Dec. 31 measurement date for its retirement plans.