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Financial Instruments (Tables)
6 Months Ended
Jul. 03, 2011
Financial Instruments [Abstract]  
Carrying value and estimated fair value of financial instruments
                                 
            Fair Value Measurements at July 3, 2011  
    Total Carrying     Quoted Prices in     Significant Other     Significant  
    Value at     Active Markets     Observable Inputs     Unobservable  
    July 3, 2011     (Level 1)     (Level 2)     Inputs (Level 3)  
Assets:
                               
Interest rate swap derivative assets
  $ 5,665     $     $ 5,665     $  
Investments other than derivatives
    7,662             7,662        
                                 
            Fair Value Measurements at January 2, 2011  
    Total Carrying     Quoted Prices in     Significant Other     Significant  
    Value at     Active Markets     Observable Inputs     Unobservable  
    January 2, 2011     (Level 1)     (Level 2)     Inputs (Level 3)  
Assets:
                               
Interest rate swap derivative assets
  $ 5,131     $     $ 5,131     $  
Investments other than derivatives
    7,533             7,533