Financial Instruments And Derivatives (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Available for sale securities	$ 1,049,558	$ 934,207
Derivatives, assets	135
Financial assets measured at fair value on a recurring basis	1,049,693	934,207
Derivatives, liabilities		157
Financial liabilities measured at fair value on a recurring basis		157
U.S. Government Agency Securities [Member]
Available for sale securities	240,102	341,510
U.S. Government Agency Securities [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities
U.S. Government Agency Securities [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities	240,102	341,510
U.S. Government Agency Securities [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
Money Market Funds [Member]
Available for sale securities	288,944	238,607
Money Market Funds [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities	288,944	238,607
Money Market Funds [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities
Money Market Funds [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
U.S. Treasury Securities [Member]
Available for sale securities	138,455	138,707
U.S. Treasury Securities [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities	138,455	138,707
U.S. Treasury Securities [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities
U.S. Treasury Securities [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
Commercial Paper [Member]
Available for sale securities	235,540	103,448
Commercial Paper [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities
Commercial Paper [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities	235,540	103,448
Commercial Paper [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
Corporate Debt Securities [Member]
Available for sale securities	129,084	92,578
Corporate Debt Securities [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities
Corporate Debt Securities [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities	129,084	92,578
Corporate Debt Securities [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
Certificates Of Deposit And Time Deposits [Member]
Available for sale securities	8,381	11,076
Certificates Of Deposit And Time Deposits [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities
Certificates Of Deposit And Time Deposits [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities	8,381	11,076
Certificates Of Deposit And Time Deposits [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
Equity And Debt Mutual Funds [Member]
Available for sale securities	8,754	8,003
Equity And Debt Mutual Funds [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities	8,754	8,003
Equity And Debt Mutual Funds [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities
Equity And Debt Mutual Funds [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
Non-U.S. Government Securities [Member]
Available for sale securities	298	278
Non-U.S. Government Securities [Member] \| Fair Value Inputs Level 1 [Member]
Available for sale securities	298	278
Non-U.S. Government Securities [Member] \| Fair Value Inputs Level 2 [Member]
Available for sale securities
Non-U.S. Government Securities [Member] \| Fair Value Inputs Level 3 [Member]
Available for sale securities
Fair Value Inputs Level 1 [Member]
Available for sale securities	436,451	385,595
Derivatives, assets
Financial assets measured at fair value on a recurring basis	436,451	385,595
Fair Value Inputs Level 2 [Member]
Available for sale securities	613,107	548,612
Derivatives, assets	135
Financial assets measured at fair value on a recurring basis	613,242	548,612
Derivatives, liabilities		157
Financial liabilities measured at fair value on a recurring basis		157
Fair Value Inputs Level 3 [Member]
Available for sale securities
Derivatives, assets
Financial assets measured at fair value on a recurring basis

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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