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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. 30, 2012
Dec. 25, 2011
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan liabilities at end of year $ (85,250) [1] $ (128,547) [1]
Fair value of plan assets at end of year 2,594,250 [1] 2,518,515 [1]
Derivative liabilities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan liabilities at end of year (58,368) [1] (56,671) [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 (2,517) [1]  
Fair value of plan assets at beginning of year 382,774 [1] 378,917
Actual Return on Plan Assets Relating to assets still held at report date 3,333 18,227
Actual Return on Plan Assets Relating to assets sold during the period (29,641) (219)
Purchases, sales, and settlements 35,614 (12,346)
Transfers in and/or out of Level 3 (3,479) [2] (1,805) [2]
Fair value of plan liabilities at end of year (2,008) [1] (2,517) [1]
Fair value of plan assets at end of year 388,601 [1] 382,774 [1]
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 (2,517) (453)
Actual Return on Plan Assets Relating to assets still held at report date 16 (8)
Actual Return on Plan Assets Relating to assets sold during the period (4) (733)
Purchases, sales, and settlements 0 1,183
Transfers in and/or out of Level 3 497 [2] (2,506) [2]
Fair value of plan liabilities at end of year (2,008) (2,517)
Mortgage Backed Securities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 71,641 [1] 166,922 [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 1,271 [1] 0
Actual Return on Plan Assets Relating to assets still held at report date 0 (11)
Actual Return on Plan Assets Relating to assets sold during the period 0 0
Purchases, sales, and settlements 0 1,282
Transfers in and/or out of Level 3 (1,271) [2] 0 [2]
Fair value of plan assets at end of year 0 [1] 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 30,317 [1] 39,687 [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 1,441 [1] 1,526
Actual Return on Plan Assets Relating to assets still held at report date 0 65
Actual Return on Plan Assets Relating to assets sold during the period 0 0
Purchases, sales, and settlements 0 (150)
Transfers in and/or out of Level 3 (1,441) [2] 0 [2]
Fair value of plan assets at end of year 0 [1] 1,441 [1]
Corporate bonds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 137,437 [1] 137,705 [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 2,070 [1] 5,896
Actual Return on Plan Assets Relating to assets still held at report date 83 (133)
Actual Return on Plan Assets Relating to assets sold during the period (589) 7
Purchases, sales, and settlements 0 205
Transfers in and/or out of Level 3 (767) [2] (3,905) [2]
Fair value of plan assets at end of year 797 [1] 2,070 [1]
Real estate
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 97,385 [1] 93,620 [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 93,620 [1] 90,344
Actual Return on Plan Assets Relating to assets still held at report date (4,788) (503)
Actual Return on Plan Assets Relating to assets sold during the period 0 0
Purchases, sales, and settlements 8,553 3,779
Transfers in and/or out of Level 3 0 [2] 0 [2]
Fair value of plan assets at end of year 97,385 [1] 93,620 [1]
Partnership/joint venture interests
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 130,995 [1] 128,121 [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 128,121 [1] 117,698
Actual Return on Plan Assets Relating to assets still held at report date (1,817) 20,706
Actual Return on Plan Assets Relating to assets sold during the period (20,781) 0
Purchases, sales, and settlements 25,472 (10,283)
Transfers in and/or out of Level 3 0 [2] 0 [2]
Fair value of plan assets at end of year 130,995 [1] 128,121 [1]
Hedge funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 236,444 [1] 232,817 [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 156,016 [1] 163,349
Actual Return on Plan Assets Relating to assets still held at report date 9,590 (1,632)
Actual Return on Plan Assets Relating to assets sold during the period (8,271) (150)
Purchases, sales, and settlements 1,589 (7,151)
Transfers in and/or out of Level 3 0 [2] 1,600 [2]
Fair value of plan assets at end of year 158,924 [1] 156,016 [1]
Derivative contracts
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Fair value of plan assets at end of year 55,457 [1] 53,826 [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 235 [1] 104
Actual Return on Plan Assets Relating to assets still held at report date 265 (265)
Actual Return on Plan Assets Relating to assets sold during the period 0 (76)
Purchases, sales, and settlements 0 (28)
Transfers in and/or out of Level 3 0 [2] 500 [2]
Fair value of plan assets at end of year $ 500 [1] $ 235 [1]
[1] The company uses a Dec. 31 measurement date for its retirement plans.
[2] (1)The company’s policy is to recognize transfers in and transfers out as of the beginning of the reporting period.