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Balance Sheet Components (Schedule Of Available-For-Sale Short-Term) (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 01, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 203,279 $ 144,767
Unrealized Gain 1 34
Unrealized Loss (7) (4)
Estimated Fair Value 203,273 144,797
U.S. Treasuries [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 200,499 144,673
Unrealized Gain 1 34
Unrealized Loss (7) (4)
Estimated Fair Value 200,493 144,703
Certificates Of Deposits [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost 2,780 94
Unrealized Gain 0 0
Unrealized Loss 0 0
Estimated Fair Value $ 2,780 $ 94