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Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 03, 2015	Dec. 31, 2014
Cash Equivalents and Investments [Line Items]
Amortized Cost	$ 1,941,905	$ 1,700,666
Unrealized Gain	2,430	441
Unrealized Loss	(437)	(845)
Fair Value	1,943,898	1,700,262
Debt securities due in one year or less	1,063,640	872,872
Debt securities due after one year through three years	799,180	763,003
Total debt securities	1,862,820	1,635,875
Cash Equivalents [Member]
Cash Equivalents and Investments [Line Items]
Amortized Cost	92,682	67,051
Fair Value	92,682	67,051
Investments [Member]
Cash Equivalents and Investments [Line Items]
Amortized Cost	1,849,223	1,633,615
Unrealized Gain	2,430	441
Unrealized Loss	(437)	(845)
Fair Value	1,851,216	1,633,211
US Treasury Securities
Cash Equivalents and Investments [Line Items]
Amortized Cost	627,630	626,683
Unrealized Gain	1,465	246
Unrealized Loss	(47)	(157)
Fair Value	629,048	626,772
Foreign Government Debt Securities
Cash Equivalents and Investments [Line Items]
Amortized Cost		24,998
Fair Value		24,998
Corporate Debt Securities
Cash Equivalents and Investments [Line Items]
Amortized Cost	1,233,267	984,668
Unrealized Gain	895	125
Unrealized Loss	(390)	(688)
Fair Value	1,233,772	984,105
Time Deposits
Cash Equivalents and Investments [Line Items]
Amortized Cost	80,931	64,240
Fair Value	80,931	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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