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Marketable Securities (Details) - USD ($) $ in Thousands	Jul. 04, 2015	Dec. 31, 2014
Cash Equivalents and Investments [Line Items]
Amortized Cost	$ 1,884,477	$ 1,700,666
Unrealized Gain	1,049	441
Unrealized Loss	(870)	(845)
Fair Value	1,884,656	1,700,262
Debt securities due in one year or less	956,322	872,872
Debt securities due after one year through three years	849,898	763,003
Total debt securities	1,806,220	1,635,875
Cash Equivalents [Member]
Cash Equivalents and Investments [Line Items]
Amortized Cost	41,638	67,051
Fair Value	41,638	67,051
Investments [Member]
Cash Equivalents and Investments [Line Items]
Amortized Cost	1,842,839	1,633,615
Unrealized Gain	1,049	441
Unrealized Loss	(870)	(845)
Fair Value	1,843,018	1,633,211
US Treasury Securities
Cash Equivalents and Investments [Line Items]
Amortized Cost	634,476	626,683
Unrealized Gain	717	246
Unrealized Loss	(135)	(157)
Fair Value	635,058	626,772
Foreign Government Debt Securities
Cash Equivalents and Investments [Line Items]
Amortized Cost	24,999	24,998
Fair Value	24,999	24,998
Corporate Debt Securities
Cash Equivalents and Investments [Line Items]
Amortized Cost	1,146,636	984,668
Unrealized Gain	262	125
Unrealized Loss	(735)	(688)
Fair Value	1,146,163	984,105
Time Deposits
Cash Equivalents and Investments [Line Items]
Amortized Cost	78,289	64,240
Fair Value	78,289	64,240
Equity Securities
Cash Equivalents and Investments [Line Items]
Amortized Cost	77	77
Unrealized Gain	70	70
Fair Value	$ 147	$ 147

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- Definition

This item represents the cost of cash equivalents and debt and equity securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities at fair value maturing in the next rolling twelve months following the latest balance sheet presented.

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Amount of debt securities at fair value maturing in the second rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented.

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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 cash equivalents and short-term investments as of the balance sheet date.

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Bonds or similar securities.

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