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Investments And Marketable Securities (Tables)
 6 Months Ended
Jul. 02, 2011
Investments And Marketable Securities  
Changes In Unrealized Gains And Losses On Available-For-Sale Securities
     Three Months Ended      Six Months Ended  
     July 2,
2011		      July 3,
2010		      July 2,
2011		      July 3,
2010		  

Changes in unrealized gains and (losses) on available-for-sale securities, net of tax, recorded in accumulated other comprehensive income

    $ 347       $ 205       $ 333       $ (42 )