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Cash and Investments (Summary by Security Type) (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Investments available-for-sale:
Amortized Cost	$ 828,843	$ 440,756
Gross Unrealized Gains	182	18
Gross Unrealized Losses	(883)	(364)
Fair Value	828,142	440,410
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	315,875	188,314	$ 155,836	$ 144,284
Total, Amortized Cost	852,322	457,522
Total, Fair Value	851,621	457,176
Money market funds
Investments available-for-sale:
Amortized Cost	47,744	45,478
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	47,744	45,478
Commercial paper
Investments available-for-sale:
Amortized Cost	381,134	199,647
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Fair Value	381,133	199,647
Corporate bonds
Investments available-for-sale:
Amortized Cost	344,741	179,336
Gross Unrealized Gains	180	18
Gross Unrealized Losses	(857)	(332)
Fair Value	344,064	179,022
U.S. Treasury and government sponsored enterprises
Investments available-for-sale:
Amortized Cost	55,224	16,295
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(25)	(32)
Fair Value	55,201	16,263
Cash and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	6,883	3,268
Fair Value	6,883	3,268
Certificates of deposit
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	16,596	13,498
Fair Value	$ 16,596	$ 13,498

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