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Fair Value Measurements (Tables)
6 Months Ended
Jul. 01, 2012
Fair Value Measurements [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
                 
    Quoted
Prices in
Active
Markets
for
Identical
Assets
(Level 1)
    Significant
Other
Observable

Inputs
(Level 2)
 

Assets:

               

Cash equivalents

  $ 134,016     $ —    

Money market instruments

    46,554       —    

Corporate stock

    353       —    

Municipal bonds

    —         122,693  

Corporate bonds

    —         46,059  

Asset-backed securities

    —         5,141  

Sovereign bonds

    —         3,882  

Agency bonds

    —         1,001  
     

Liabilities:

               

Currency forward contracts

    57       —