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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Dec. 29, 2017
Investment [Line Items]
Amortized Cost	$ 595,607	$ 440,756
Gross Unrealized Gains	54	18
Gross Unrealized Losses	(785)	(364)
Fair Value	594,876	440,410
Money market funds
Investment [Line Items]
Amortized Cost	54,546	45,478
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	54,546	45,478
Certificates of deposit
Investment [Line Items]
Amortized Cost	21,095
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	21,095
Commercial paper
Investment [Line Items]
Amortized Cost	280,654	199,647
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	280,654	199,647
Corporate bonds
Investment [Line Items]
Amortized Cost	218,780	179,336
Gross Unrealized Gains	54	18
Gross Unrealized Losses	(730)	(332)
Fair Value	218,104	179,022
U.S. Treasury and government sponsored enterprises
Investment [Line Items]
Amortized Cost	20,532	16,295
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(55)	(32)
Fair Value	$ 20,477	$ 16,263

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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