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Fair Values of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 30, 2012
Jan. 01, 2012
Financial instruments    
Public debt securities, carrying value $ (423,386) $ (523,219)
Carrying Amount [Member]
   
Financial instruments    
Public debt securities, carrying value (373,386) (523,219)
Deferred compensation plan assets 13,011 10,709
Deferred compensation plan liabilities (13,011) (10,709)
Non-public variable rate debt 50,000 0
Carrying Amount [Member] | Commodity hedges [Member]
   
Financial instruments    
Commodity hedging agreements, Fair Value 500 0
Fair Value [Member]
   
Financial instruments    
Public debt securities, fair value (426,050) (576,127)
Deferred compensation plan assets 13,011 10,709
Deferred compensation plan liabilities (13,011) (10,709)
Non-public variable rate debt 50,000 0
Fair Value [Member] | Commodity hedges [Member]
   
Financial instruments    
Commodity hedging agreements, Fair Value $ 500 $ 0