Investments (Details) - USD ($) $ in Thousands	Apr. 02, 2016	Jan. 02, 2016
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 456,003	$ 400,173
Gross Unrealized Gains	182	34
Gross Unrealized Losses	(209)	(674)
Fair Value	455,976	399,533
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	61,887	132,502
Fair Value	61,887	132,502
Cash equivalents [Member] | Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	55,405	126,752
Fair Value	55,405	126,752
Cash equivalents [Member] | Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	6,394	5,677
Fair Value	6,394	5,677
Cash equivalents [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	88	73
Fair Value	88	73
Short-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	207,915	111,144
Gross Unrealized Gains	48	20
Gross Unrealized Losses	(103)	(105)
Fair Value	207,860	111,059
Short-term investments [Member] | Time deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	30,700	30,989
Fair Value	30,700	30,989
Short-term investments [Member] | Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	10,000	1,500
Gross Unrealized Losses	(13)	(2)
Fair Value	9,987	1,498
Short-term investments [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	167,215	78,655
Gross Unrealized Gains	48	20
Gross Unrealized Losses	(90)	(103)
Fair Value	167,173	78,572
Long-term investments [Member] | Government and corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	186,201	156,527
Gross Unrealized Gains	134	14
Gross Unrealized Losses	(106)	(569)
Fair Value	$ 186,229	$ 155,972