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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 29, 2014 | Dec. 31, 2013
--- | --- | ---
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | $ 1,493,508 | $ 1,399,712
Unrealized Gain | 559 | 371
Unrealized Loss | (289) | (243)
Cash Equivalents and Short-Term Investments, Fair Value | 1,493,778 | 1,399,840
Debt securities due in one year or less | 964,559 | 1,011,459
Debt securities due after one year through two years | 458,227 | 314,184
Total debt securities | 1,422,786 | 1,325,643
Cash Equivalents [Member] |  |
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | 35,965 | 36,966
Cash Equivalents and Short-Term Investments, Fair Value | 35,965 | 36,966
Investments [Member] |  |
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | 1,457,543 | 1,362,746
Unrealized Gain | 559 | 371
Unrealized Loss | (289) | (243)
Cash Equivalents and Short-Term Investments, Fair Value | 1,457,813 | 1,362,874
US Treasury Securities [Member] |  |
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | 629,857 | 556,438
Unrealized Gain | 184 | 111
Unrealized Loss | (60) | (10)
Cash Equivalents and Short-Term Investments, Fair Value | 629,981 | 556,539
Foreign Government Debt Securities [Member] |  |
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | 34,990 | 139,670
Cash Equivalents and Short-Term Investments, Fair Value | 34,990 | 139,670
Corporate Debt Securities [Member] |  |
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | 757,739 | 629,477
Unrealized Gain | 305 | 190
Unrealized Loss | (229) | (233)
Cash Equivalents and Short-Term Investments, Fair Value | 757,815 | 629,434
Time Deposits [Member] |  |
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | 70,845 | 74,050
Cash Equivalents and Short-Term Investments, Fair Value | 70,845 | 74,050
Equity Securities [Member] |  |
Cash, Cash Equivalents and Short-Term Investments [Line Items] |  |
Amortized Cost | 77 | 77
Unrealized Gain | 70 | 70
Cash Equivalents and Short-Term Investments, 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 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. + 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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