Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Short-term investments:
Available-for-sale securities	$ 96,019	$ 100,704
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC, trust	22,339	24,329
2015 Notes Hedges	292,511	303,154
Foreign currency exchange contracts	1,662	1,737
Total Assets	889,094	996,258
Liabilities
Acquisition-related contingent consideration	3,835	4,218
2015 Notes Embedded Conversion Derivative	292,511	303,154
Total Liabilities	296,346	307,372
Money market funds [Member]
Assets
Cash equivalents	475,563	566,334
Corporate debt securities [Member]
Short-term investments:
Available-for-sale securities	36,878	31,359
Bank certificates of deposit [Member]
Assets
Cash equivalents	1,000
Short-term investments:
Available-for-sale securities	18,313	27,826
United States Treasury securities [Member]
Short-term investments:
Available-for-sale securities	24,738	23,239
United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	11,227	10,258
Commercial paper [Member]
Short-term investments:
Available-for-sale securities	2,797	5,783
Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	2,066	2,239
Fair Value Measurements, Level 1 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC, trust	22,339	24,329
2015 Notes Hedges	0	0
Foreign currency exchange contracts	0	0
Total Assets	535,933	626,399
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	475,563	566,334
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	24,738	23,239
Fair Value Measurements, Level 1 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	11,227	10,258
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	2,066	2,239
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	292,511	303,154
Foreign currency exchange contracts	1,662	1,737
Total Assets	353,161	369,859
Liabilities
Acquisition-related contingent consideration	0	0
2015 Notes Embedded Conversion Derivative	292,511	303,154
Total Liabilities	292,511	303,154
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	36,878	31,359
Fair Value Measurements, Level 2 [Member] \| Bank certificates of deposit [Member]
Assets
Cash equivalents	1,000
Short-term investments:
Available-for-sale securities	18,313	27,826
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	2,797	5,783
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	3,835	4,218
2015 Notes Embedded Conversion Derivative	0	0
Total Liabilities	3,835	4,218
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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