Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Short-term investments:
Available-for-sale securities	$ 95,819	$ 3,037
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC	23,561	24,058
2015 Notes Hedges	287,079	215,113
Foreign currency exchange contracts	778	200
Total Assets	897,678	726,510
Liabilities
Acquisition-related contingent consideration	4,108	3,911
2015 Notes Embedded Conversion Derivative	287,079	215,113
Total Liabilities	291,187	219,024
Corporate debt securities [Member]
Assets
Cash equivalents	501
Short-term investments:
Available-for-sale securities	32,613
United States Treasury securities [Member]
Assets
Cash equivalents	3,975
Short-term investments:
Available-for-sale securities	21,460
United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	8,235
Bank certificates of deposit [Member]
Assets
Cash equivalents	1,000
Short-term investments:
Available-for-sale securities	28,522
Commercial paper [Member]
Assets
Cash equivalents	500
Short-term investments:
Available-for-sale securities	2,988
Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	2,001	3,037
Money market funds [Member]
Assets
Cash equivalents	484,465	484,102
Fair Value Measurements, Level 1 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC	23,561	24,058
2015 Notes Hedges	0	0
Foreign currency exchange contracts	0	0
Total Assets	543,697	511,197
Liabilities
Acquisition-related contingent consideration	0	0
2015 Notes Embedded Conversion Derivative	0	0
Total Liabilities	0	0
Fair Value Measurements, Level 1 [Member] \| Corporate debt securities [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 1 [Member] \| United States Treasury securities [Member]
Assets
Cash equivalents	3,975
Short-term investments:
Available-for-sale securities	21,460
Fair Value Measurements, Level 1 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	8,235
Fair Value Measurements, Level 1 [Member] \| Bank certificates of deposit [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 1 [Member] \| Commercial paper [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 1 [Member] \| Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	2,001	3,037
Fair Value Measurements, Level 1 [Member] \| Money market funds [Member]
Assets
Cash equivalents	484,465	484,102
Fair Value Measurements, Level 2 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC	0	0
2015 Notes Hedges	287,079	215,113
Foreign currency exchange contracts	778	200
Total Assets	353,981	215,313
Liabilities
Acquisition-related contingent consideration	0	0
2015 Notes Embedded Conversion Derivative	287,079	215,113
Total Liabilities	287,079	215,113
Fair Value Measurements, Level 2 [Member] \| Corporate debt securities [Member]
Assets
Cash equivalents	501
Short-term investments:
Available-for-sale securities	32,613
Fair Value Measurements, Level 2 [Member] \| United States Treasury securities [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 2 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 2 [Member] \| Bank certificates of deposit [Member]
Assets
Cash equivalents	1,000
Short-term investments:
Available-for-sale securities	28,522
Fair Value Measurements, Level 2 [Member] \| Commercial paper [Member]
Assets
Cash equivalents	500
Short-term investments:
Available-for-sale securities	2,988
Fair Value Measurements, Level 2 [Member] \| Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 2 [Member] \| Money market funds [Member]
Assets
Cash equivalents	0	0
Fair Value Measurements, Level 3 [Member]
Short-term investments:
Trading securities held in Non - Qualified Deferred Compensation Plan, or NQDC	0	0
2015 Notes Hedges	0	0
Foreign currency exchange contracts	0	0
Total Assets	0	0
Liabilities
Acquisition-related contingent consideration	4,108	3,911
2015 Notes Embedded Conversion Derivative	0	0
Total Liabilities	4,108	3,911
Fair Value Measurements, Level 3 [Member] \| Corporate debt securities [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 3 [Member] \| United States Treasury securities [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 3 [Member] \| United States government agency securities [Member]
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 3 [Member] \| Bank certificates of deposit [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 3 [Member] \| Commercial paper [Member]
Assets
Cash equivalents	0
Short-term investments:
Available-for-sale securities	0
Fair Value Measurements, Level 3 [Member] \| Marketable equity securities [Member]
Short-term investments:
Available-for-sale securities	0	0
Fair Value Measurements, Level 3 [Member] \| Money market funds [Member]
Assets
Cash equivalents	$ 0	$ 0

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