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Fair Value of Assets and Liabilities - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets $ 739,579 $ 643,768 $ 599,889
Total derivative assets 1,002 1,088  
Total derivative liabilities (28) (268)  
Net derivative asset 974 820  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 216,057 163,150  
Total derivative assets 0 0  
Total derivative liabilities 0 0  
Net derivative asset 0 0  
Deferred Compensation Plan, Fair Value of Plan Liability 0 0  
Net effect of financial asset less financial liability 216,057 163,150  
Fair Value, Inputs, Level 1 [Member] | Hedge Funds [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 1 [Member] | U.S. Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 140,880 111,878  
Fair Value, Inputs, Level 1 [Member] | Foreign Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 50,661 40,279  
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 18,644 6,443  
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Commodities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Cash and Other [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 5,872 4,550  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 208,039 194,643  
Total derivative assets 1,002 1,088  
Total derivative liabilities (28) (268)  
Net derivative asset 974 820  
Deferred Compensation Plan, Fair Value of Plan Liability (17,036) (8,493)  
Net effect of financial asset less financial liability 191,977 186,970  
Fair Value, Inputs, Level 2 [Member] | Hedge Funds [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 2 [Member] | U.S. Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 27,902 20,824  
Fair Value, Inputs, Level 2 [Member] | Foreign Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 77,152 64,348  
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 87,578 96,385  
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Commodities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 15,407 13,086  
Fair Value, Inputs, Level 2 [Member] | Cash and Other [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 315,483 285,975  
Total derivative assets 0 0  
Total derivative liabilities 0 0  
Net derivative asset 0 0  
Deferred Compensation Plan, Fair Value of Plan Liability 0 0  
Net effect of financial asset less financial liability 315,483 285,975  
Fair Value, Inputs, Level 3 [Member] | Hedge Funds [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 281,908 253,391 242,594
Fair Value, Inputs, Level 3 [Member] | Hedge Funds [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 281,908 253,391  
Fair Value, Inputs, Level 3 [Member] | U.S. Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Foreign Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 33,575 32,584 30,729
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 33,575 32,584  
Fair Value, Inputs, Level 3 [Member] | Commodities [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Cash and Other [Member] | Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined benefit pension plan investment assets $ 0 $ 0