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Fair Value Measurements (Tables)
9 Months Ended
Oct. 02, 2011
Fair Value Measurements [Abstract] 
Assets and liabilities measured at fair value on a recurring basis
                 
    Quoted Prices in    
    Active Markets   Significant Other
    for Identical   Observable
    Assets (Level 1)   Inputs (Level 2)
Assets:
               
Money market instruments
  $ 2,137     $ —  
Municipal bonds
    —       120,209  
Corporate bonds
    —       125,329  
Agency bonds
    —       45,170  
Sovereign bonds
    —       12,971  
Covered bonds
    —       6,318  
Currency forward contracts
    13       —  
 
               
Liabilities:
               
Currency forward contracts
    370       —