Investments (Details) - USD ($) $ in Thousands	Oct. 01, 2016	Jan. 02, 2016
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 511,929	$ 400,173
Gross Unrealized Gains	29	34
Gross Unrealized Losses	(404)	(674)
Fair Value	511,554	399,533
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	120,077	132,502
Fair Value	120,077	132,502
Cash equivalents [Member] | Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	108,378	126,752
Fair Value	108,378	126,752
Cash equivalents [Member] | Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	9,199	5,677
Fair Value	9,199	5,677
Cash equivalents [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	2,500
Fair Value	2,500
Cash equivalents [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost		73
Fair Value		73
Short-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	261,356	111,144
Gross Unrealized Gains	12	20
Gross Unrealized Losses	(183)	(105)
Fair Value	261,185	111,059
Short-term investments [Member] | Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	44,980	30,989
Fair Value	44,980	30,989
Short-term investments [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	37,825	1,500
Gross Unrealized Losses	(50)	(2)
Fair Value	37,775	1,498
Short-term investments [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	178,551	78,655
Gross Unrealized Gains	12	20
Gross Unrealized Losses	(133)	(103)
Fair Value	178,430	78,572
Long-term investments [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	130,496	156,527
Gross Unrealized Gains	17	14
Gross Unrealized Losses	(221)	(569)
Fair Value	$ 130,292	$ 155,972