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Employee Benefits (Plan Assets) (Details) (Pension Benefits [Member], USD $)
12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Target Allocations      
Target Allocation, Equity securities 67.00%    
Target Allocation, Fixed income 31.00%    
Target Allocation, Other 2.00%    
Target Allocation, Total 100.00%    
Actual Allocations      
Defined Benefit Plan, Equity Securities 59.00% 65.00%  
Defined Benefit Plan, Debt Securities 37.00% 31.00%  
Defined Benefit Plan, Other Plan Assets 4.00% 4.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%  
Fair value of plan assets $ 202,652,000 $ 192,429,000 $ 174,022,000
Cash [Member]
     
Actual Allocations      
Fair value of plan assets 1,132,000    
Common Stock [Member]
     
Actual Allocations      
Fair value of plan assets 85,288,000 [1]    
Debt Securities [Member]
     
Actual Allocations      
Fair value of plan assets 54,067,000 [1]    
Mutual Funds [Member]
     
Actual Allocations      
Fair value of plan assets 60,377,000 [2]    
Life Insurance Policies [Member]
     
Actual Allocations      
Fair value of plan assets 1,703,000 [3]    
Other Plan Asset Categories [Member]
     
Actual Allocations      
Fair value of plan assets 85,000 [4]    
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
     
Actual Allocations      
Fair value of plan assets 186,390,000    
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Cash [Member]
     
Actual Allocations      
Fair value of plan assets 1,132,000    
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Common Stock [Member]
     
Actual Allocations      
Fair value of plan assets 85,288,000 [1]    
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Debt Securities [Member]
     
Actual Allocations      
Fair value of plan assets 54,067,000 [1]    
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Mutual Funds [Member]
     
Actual Allocations      
Fair value of plan assets 45,818,000 [2]    
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Life Insurance Policies [Member]
     
Actual Allocations      
Fair value of plan assets 0 [2]    
Quoted Prices in Active Markets for Identical Assets Level 1 [Member] | Other Plan Asset Categories [Member]
     
Actual Allocations      
Fair value of plan assets 85,000 [4]    
Significant Other Observable Inputs Level 2 [Member]
     
Actual Allocations      
Fair value of plan assets 14,843,000    
Significant Other Observable Inputs Level 2 [Member] | Cash [Member]
     
Actual Allocations      
Fair value of plan assets 0    
Significant Other Observable Inputs Level 2 [Member] | Common Stock [Member]
     
Actual Allocations      
Fair value of plan assets 0 [1]    
Significant Other Observable Inputs Level 2 [Member] | Debt Securities [Member]
     
Actual Allocations      
Fair value of plan assets 0 [1]    
Significant Other Observable Inputs Level 2 [Member] | Mutual Funds [Member]
     
Actual Allocations      
Fair value of plan assets 14,559,000 [2]    
Significant Other Observable Inputs Level 2 [Member] | Life Insurance Policies [Member]
     
Actual Allocations      
Fair value of plan assets 284,000 [3]    
Significant Other Observable Inputs Level 2 [Member] | Other Plan Asset Categories [Member]
     
Actual Allocations      
Fair value of plan assets 0 [4]    
Significant Unobservable Inputs Level 3 [Member]
     
Actual Allocations      
Fair value of plan assets 1,419,000 1,203,000  
Significant Unobservable Inputs Level 3 [Member] | Cash [Member]
     
Actual Allocations      
Fair value of plan assets 0    
Significant Unobservable Inputs Level 3 [Member] | Common Stock [Member]
     
Actual Allocations      
Fair value of plan assets 0 [1]    
Significant Unobservable Inputs Level 3 [Member] | Debt Securities [Member]
     
Actual Allocations      
Fair value of plan assets 0 [1]    
Significant Unobservable Inputs Level 3 [Member] | Mutual Funds [Member]
     
Actual Allocations      
Fair value of plan assets 0 [2]    
Significant Unobservable Inputs Level 3 [Member] | Life Insurance Policies [Member]
     
Actual Allocations      
Fair value of plan assets 1,419,000 [3]    
Significant Unobservable Inputs Level 3 [Member] | Other Plan Asset Categories [Member]
     
Actual Allocations      
Fair value of plan assets $ 0 [4]    
[1] This category comprises investments valued at the closing price reported on the active market on which the individual securities are traded.
[2] This category comprises mutual funds valued at the net asset value of shares held at year end.
[3] This category comprises life insurance policies valued at cash surrender value at year end.
[4] This comprises annuity policies held with various insurance companies valued at face value.