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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. + References No definition available. + Details
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- Definition Amount of debt securities at fair value maturing in the next rolling twelve months following the latest balance sheet presented. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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