Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Short-term investments:
Available-for-sale securities	$ 94,970	$ 96,788
Trading securities held in Non - Qualified Deferred Compensation plan, or NQDC, trust	25,425	23,960
2015 Notes Hedges	452,498	306,817
Foreign currency exchange contracts		262
Total Assets	869,748	775,999
Liabilities
Acquisition-related contingent consideration	0	4,091
2015 Notes Embedded Conversion Derivative	452,498	306,817
Foreign currency exchange contracts	1,730
Total Liabilities	454,228	310,908
Money market funds [Member]
Assets
Cash equivalents	296,855	345,872
Corporate debt securities [Member]
Short-term investments:
Available-for-sale securities	36,725	37,441
Bank certificates of deposit [Member]
Assets
Cash equivalents		2,300
Short-term investments:
Available-for-sale securities	25,906	20,308
United States Treasury securities [Member]
Short-term investments:
Available-for-sale securities	19,655	24,246
United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	8,357	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	2,332	2,077
Fair Value Measurements, Level 1 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation plan, or NQDC, trust	25,425	23,960
2015 Notes Hedges	0	0
Foreign currency exchange contracts		0
Total Assets	352,624	406,378
Liabilities
Acquisition-related contingent consideration		0
2015 Notes Embedded Conversion Derivative	0	0
Foreign currency exchange contracts	0
Total Liabilities	0	0
Fair Value Measurements, Level 1 [Member] \| Money market funds [Member]
Assets
Cash equivalents	296,855	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	19,655	24,246
Fair Value Measurements, Level 1 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	8,357	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	2,332	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	452,498	306,817
Foreign currency exchange contracts		262
Total Assets	517,124	369,621
Liabilities
Acquisition-related contingent consideration		0
2015 Notes Embedded Conversion Derivative	452,498	306,817
Foreign currency exchange contracts	1,730
Total Liabilities	454,228	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	36,725	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	25,906	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
Total Assets	0	0
Liabilities
Acquisition-related contingent consideration		4,091
2015 Notes Embedded Conversion Derivative	0	0
Foreign currency exchange contracts	0
Total Liabilities	0	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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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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