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Investments And Marketable Securities (Tables)
9 Months Ended
Oct. 01, 2011
Investments And Marketable Securities [Abstract] 
Changes In Unrealized Gains And Losses On Available-For-Sale Securities
     Three Months Ended      Nine Months Ended  
     October 1,
2011		     October 2,
2010		      October 1,
2011		     October 2,
2010		  

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

    $ (636 )    $ 8       $ (303 )    $ (34 )