Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 1,286,801	$ 1,314,641
Gross Unrealized Gains	660	863
Gross Unrealized Losses	(427)	(537)
Fair Value	1,287,034	1,314,967
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	82,395	92,335
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	82,395	92,335
Cash equivalents [Member] | Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	66,400	68,267
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	66,400	68,267
Cash equivalents [Member] | Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	9,785	24,068
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	9,785	24,068
Cash equivalents [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	6,210
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	6,210
Short-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	633,888	719,271
Gross Unrealized Gains	451	529
Gross Unrealized Losses	(31)	(135)
Fair Value	634,308	719,665
Short-term investments [Member] | Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	81,515	90,535
Gross Unrealized Gains	12	17
Gross Unrealized Losses	(3)	(2)
Fair Value	81,524	90,550
Short-term investments [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	43,750	86,500
Gross Unrealized Gains	7	15
Gross Unrealized Losses		(57)
Fair Value	43,757	86,458
Short-term investments [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	508,623	542,236
Gross Unrealized Gains	432	497
Gross Unrealized Losses	(28)	(76)
Fair Value	509,027	542,657
Long-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	570,518	503,035
Gross Unrealized Gains	209	334
Gross Unrealized Losses	(396)	(402)
Fair Value	570,331	502,967
Long-term investments [Member] | Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	490	6,190
Gross Unrealized Gains	1	10
Gross Unrealized Losses	0	(3)
Fair Value	491	6,197
Long-term investments [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	570,028	496,845
Gross Unrealized Gains	208	324
Gross Unrealized Losses	(396)	(399)
Fair Value	$ 569,840	$ 496,770