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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. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Fair value of plan assets at end of year $ 3,028,467 [1] $ 2,552,316 [1]  
Defined Benefit Plan, Fair Value of Plan Assets only 2,978,584 [1] 2,594,250 [1]  
Fair value of plan liabilities at end of year (11,502) [1] (85,250) [1]  
Derivative liabilities
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Fair value of plan liabilities at end of year (11,502) [1] (58,368) [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 (2,008) [1]    
Defined Benefit Plan, Actual Return on Plan Assets Still Held 31,273 3,333  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period 14,123 (29,641)  
Purchases, sales, and settlements 64,869 35,614  
Transfers in and/or out of Level 3 0 [2] (3,479) [2]  
Fair value of plan assets at end of year 496,858 [1] 386,593 [1]  
Defined Benefit Plan, Fair Value of Plan Assets only 498,866 [1] 388,601 [1] 382,774
Fair value of plan liabilities at end of year (2,008) [1] (2,008) [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 (2,008) (2,517)  
Defined Benefit Plan, Actual Return on Plan Assets Still Held 0 16  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period 0 (4)  
Purchases, sales, and settlements 0 0  
Transfers in and/or out of Level 3 0 [2] 497 [2]  
Fair value of plan liabilities at end of year (2,008) (2,008)  
Mortgage Backed Securities
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 3,975 [1] 71,641 [1]  
Mortgage Backed Securities | Fair Value, Inputs, Level 3
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Actual Return on Plan Assets Still Held   0  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period   0  
Purchases, sales, and settlements   0  
Transfers in and/or out of Level 3   (1,271) [2]  
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1] 1,271
Other government bonds
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 72,748 [1] 30,317 [1]  
Other government bonds | Fair Value, Inputs, Level 3
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Actual Return on Plan Assets Still Held   0  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period   0  
Purchases, sales, and settlements   0  
Transfers in and/or out of Level 3   (1,441) [2]  
Defined Benefit Plan, Fair Value of Plan Assets only 0 [1] 0 [1] 1,441
Corporate bonds
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 31,087 [1] 137,437 [1]  
Corporate bonds | Fair Value, Inputs, Level 3
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Actual Return on Plan Assets Still Held 199 83  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period (7) (589)  
Purchases, sales, and settlements 264 0  
Transfers in and/or out of Level 3 0 [2] (767) [2]  
Defined Benefit Plan, Fair Value of Plan Assets only 1,253 [1] 797 [1] 2,070
Real estate
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 98,909 [1] 97,385 [1]  
Real estate | Fair Value, Inputs, Level 3
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Actual Return on Plan Assets Still Held 1,865 (4,788)  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period 0 0  
Purchases, sales, and settlements (341) 8,553  
Transfers in and/or out of Level 3 0 [2] 0 [2]  
Defined Benefit Plan, Fair Value of Plan Assets only 98,909 [1] 97,385 [1] 93,620
Partnership/joint venture interests
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 184,952 [1] 130,995 [1]  
Partnership/joint venture interests | Fair Value, Inputs, Level 3
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Actual Return on Plan Assets Still Held 11,972 (1,817)  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period 13,327 (20,781)  
Purchases, sales, and settlements (9,576) 25,472  
Transfers in and/or out of Level 3 1,832 [2] 0 [2]  
Defined Benefit Plan, Fair Value of Plan Assets only 148,550 [1] 130,995 [1] 128,121
Hedge funds
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 272,676 [1] 236,444 [1]  
Hedge funds | Fair Value, Inputs, Level 3
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Actual Return on Plan Assets Still Held 17,613 9,590  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period 803 (8,271)  
Purchases, sales, and settlements 74,483 1,589  
Transfers in and/or out of Level 3 (1,832) [2] 0 [2]  
Defined Benefit Plan, Fair Value of Plan Assets only 249,991 [1] 158,924 [1] 156,016
Derivative contracts
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets only 11,141 [1] 55,457 [1]  
Derivative contracts | Fair Value, Inputs, Level 3
      
Schedule of Pension Plan Assets by Fair Value [Line Items]      
Defined Benefit Plan, Actual Return on Plan Assets Still Held (376) 265  
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period 0 0  
Purchases, sales, and settlements 39 0  
Transfers in and/or out of Level 3 0 [2] 0 [2]  
Defined Benefit Plan, Fair Value of Plan Assets only $ 163 [1] $ 500 [1] $ 235
[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.