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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Sep. 28, 2018	Dec. 29, 2017
Investment [Line Items]
Amortized Cost	$ 749,814	$ 440,756
Gross Unrealized Gains	94	18
Gross Unrealized Losses	(607)	(364)
Fair Value	749,301	440,410
Money market funds
Investment [Line Items]
Amortized Cost	62,325	45,478
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	62,325	45,478
Certificates of deposit
Investment [Line Items]
Amortized Cost	19,098
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	19,098
Commercial paper
Investment [Line Items]
Amortized Cost	355,720	199,647
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	355,720	199,647
Corporate bonds
Investment [Line Items]
Amortized Cost	262,050	179,336
Gross Unrealized Gains	93	18
Gross Unrealized Losses	(549)	(332)
Fair Value	261,594	179,022
U.S. Treasury and government sponsored enterprises
Investment [Line Items]
Amortized Cost	50,621	16,295
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(58)	(32)
Fair Value	$ 50,564	$ 16,263

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