Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Short-term investments:
Available-for-sale securities	$ 97,910	$ 96,788
Trading securities held in Non - Qualified Deferred Compensation plan, or NQDC, trust	25,070	23,960
2015 Notes Hedges	455,844	306,817
Foreign currency exchange contracts	471	262
Total Assets	936,911	775,999
Liabilities
Acquisition-related contingent consideration	1,850	4,091
2015 Notes Embedded Conversion Derivative	455,844	306,817
Total Liabilities	457,694	310,908
Money market funds [Member]
Assets
Cash equivalents	357,616	345,872
Corporate debt securities [Member]
Short-term investments:
Available-for-sale securities	36,625	37,441
Bank certificates of deposit [Member]
Assets
Cash equivalents		2,300
Short-term investments:
Available-for-sale securities	24,259	20,308
United States Treasury securities [Member]
Short-term investments:
Available-for-sale securities	19,310	24,246
United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	11,361	10,223
Commercial paper [Member]
Short-term investments:
Available-for-sale securities	1,995	2,493
Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	4,360	2,077
Fair Value Measurements, Level 1 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation plan, or NQDC, trust	25,070	23,960
2015 Notes Hedges	0	0
Foreign currency exchange contracts	0	0
Total Assets	417,717	406,378
Liabilities
Acquisition-related contingent consideration	0	0
2015 Notes Embedded Conversion Derivative	0	0
Total Liabilities	0	0
Fair Value Measurements, Level 1 [Member] \| Money market funds [Member]
Assets
Cash equivalents	357,616	345,872
Fair Value Measurements, Level 1 [Member] \| Corporate debt securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 1 [Member] \| Bank certificates of deposit [Member]
Assets
Cash equivalents		0
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 1 [Member] \| United States Treasury securities [Member]
Short-term investments:
Available-for-sale securities	19,310	24,246
Fair Value Measurements, Level 1 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	11,361	10,223
Fair Value Measurements, Level 1 [Member] \| Commercial paper [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 1 [Member] \| Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	4,360	2,077
Fair Value Measurements, Level 2 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation plan, or NQDC, trust	0	0
2015 Notes Hedges	455,844	306,817
Foreign currency exchange contracts	471	262
Total Assets	519,194	369,621
Liabilities
Acquisition-related contingent consideration	0	0
2015 Notes Embedded Conversion Derivative	455,844	306,817
Total Liabilities	455,844	306,817
Fair Value Measurements, Level 2 [Member] \| Money market funds [Member]
Assets
Cash equivalents	0	0
Fair Value Measurements, Level 2 [Member] \| Corporate debt securities [Member]
Short-term investments:
Available-for-sale securities	36,625	37,441
Fair Value Measurements, Level 2 [Member] \| Bank certificates of deposit [Member]
Assets
Cash equivalents		2,300
Short-term investments:
Available-for-sale securities	24,259	20,308
Fair Value Measurements, Level 2 [Member] \| United States Treasury securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 2 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 2 [Member] \| Commercial paper [Member]
Short-term investments:
Available-for-sale securities	1,995	2,493
Fair Value Measurements, Level 2 [Member] \| Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 3 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation plan, or NQDC, trust	0	0
2015 Notes Hedges	0	0
Foreign currency exchange contracts	0	0
Total Assets	0	0
Liabilities
Acquisition-related contingent consideration	1,850	4,091
2015 Notes Embedded Conversion Derivative	0	0
Total Liabilities	1,850	4,091
Fair Value Measurements, Level 3 [Member] \| Money market funds [Member]
Assets
Cash equivalents	0	0
Fair Value Measurements, Level 3 [Member] \| Corporate debt securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 3 [Member] \| Bank certificates of deposit [Member]
Assets
Cash equivalents		0
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 3 [Member] \| United States Treasury securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 3 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 3 [Member] \| Commercial paper [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 3 [Member] \| Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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