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Summary of Changes in Fair Value of Pension Plan Assets and Liabilities Categorized as Level 3 (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 25, 2011
Dec. 26, 2010
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan liabilities at end of year $ (128,547) [1] $ (90,234) [1]
Fair value of plan assets at end of year 2,518,515 [1] 2,644,352 [1]
Derivative liabilities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan liabilities at end of year (56,671) [1] (90,234) [1]
Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan liabilities at beginning of year (453) [1]  
Fair value of plan assets at beginning of year 378,917 381,782
Actual Return on Plan Assets Relating to assets still held at report date 18,227 40,222
Actual Return on Plan Assets Relating to assets sold during the period (219) (99)
Purchases, sales, and settlements (12,346) (46,263)
Transfers in and/or out of Level 3 (1,805) [2] 3,275 [2]
Fair value of plan liabilities at end of year (2,517) [1] (453) [1]
Fair value of plan assets at end of year 382,774 [1] 378,917
Fair Value, Inputs, Level 3 | Derivative liabilities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan liabilities at beginning of year (453) [1] (3)
Actual Return on Plan Assets Relating to assets still held at report date (8) (453)
Actual Return on Plan Assets Relating to assets sold during the period (733) 11
Purchases, sales, and settlements 1,183 (8)
Transfers in and/or out of Level 3 (2,506) [2]  
Fair value of plan liabilities at end of year (2,517) [1] (453) [1]
Mortgage Backed Securities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 166,922 [1] 83,070 [1]
Mortgage Backed Securities | Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at beginning of year   3,437
Actual Return on Plan Assets Relating to assets still held at report date (11)  
Actual Return on Plan Assets Relating to assets sold during the period   (17)
Purchases, sales, and settlements 1,282 (3,420)
Fair value of plan assets at end of year 1,271 [1]  
Other government bonds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 39,687 [1] 32,367 [1]
Other government bonds | Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at beginning of year 1,526 [1]  
Actual Return on Plan Assets Relating to assets still held at report date 65 9
Purchases, sales, and settlements (150) 1,517
Fair value of plan assets at end of year 1,441 [1] 1,526 [1]
Corporate bonds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 137,705 [1] 175,306 [1]
Corporate bonds | Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at beginning of year 5,896 [1] 15,191
Actual Return on Plan Assets Relating to assets still held at report date (133) 466
Actual Return on Plan Assets Relating to assets sold during the period 7 7
Purchases, sales, and settlements 205 (7,816)
Transfers in and/or out of Level 3 (3,905) [2] (1,952) [2]
Fair value of plan assets at end of year 2,070 [1] 5,896 [1]
Real estate
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 93,620 [1] 90,344 [1]
Real estate | Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at beginning of year 90,344 [1] 91,765
Actual Return on Plan Assets Relating to assets still held at report date (503) 670
Purchases, sales, and settlements 3,779 (2,091)
Fair value of plan assets at end of year 93,620 [1] 90,344 [1]
Partnership/joint venture interests
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 128,121 [1] 117,698 [1]
Partnership/joint venture interests | Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at beginning of year 117,698 [1] 95,965
Actual Return on Plan Assets Relating to assets still held at report date 20,706 22,273
Purchases, sales, and settlements (10,283) (5,767)
Transfers in and/or out of Level 3   5,227 [2]
Fair value of plan assets at end of year 128,121 [1] 117,698 [1]
Hedge funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 232,817 [1] 241,200 [1]
Hedge funds | Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at beginning of year 163,349 [1] 173,559
Actual Return on Plan Assets Relating to assets still held at report date (1,632) 17,032
Actual Return on Plan Assets Relating to assets sold during the period (150)  
Purchases, sales, and settlements (7,151) (27,242)
Transfers in and/or out of Level 3 1,600 [2]  
Fair value of plan assets at end of year 156,016 [1] 163,349 [1]
Derivative contracts
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 53,826 [1] 85,245 [1]
Derivative contracts | Fair Value, Inputs, Level 3
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at beginning of year 104 [1] 1,865
Actual Return on Plan Assets Relating to assets still held at report date (265) (228)
Actual Return on Plan Assets Relating to assets sold during the period (76) (89)
Purchases, sales, and settlements (28) (1,444)
Transfers in and/or out of Level 3 500 [2]  
Fair value of plan assets at end of year $ 235 [1] $ 104 [1]
[1] The company uses a Dec. 31 measurement date for its retirement plans.
[2] The company's policy is to recognize transfers in and transfers out as of the beginning of the reporting period.