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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Mar. 29, 2019	Dec. 28, 2018	Mar. 30, 2018	Dec. 29, 2017
Investment [Line Items]
Amortized Cost	$ 991,239	$ 828,843
Amortized Cost	375,037	315,875	$ 234,335	$ 188,314
Gross Unrealized Gains	1,298	182
Gross Unrealized Losses	(177)	(883)
Fair Value	992,360	828,142
Total cash and investments, amortized cost	1,018,248	852,322
Total cash and investments, fair value	1,019,369	851,621
Money market funds
Investment [Line Items]
Amortized Cost	75,171	47,744
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	75,171	47,744
Commercial paper
Investment [Line Items]
Amortized Cost	414,317	381,134
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	414,317	381,133
Corporate bonds
Investment [Line Items]
Amortized Cost	417,303	344,741
Gross Unrealized Gains	1,257	180
Gross Unrealized Losses	(175)	(857)
Fair Value	418,385	344,064
U.S. Treasury and government sponsored enterprises
Investment [Line Items]
Amortized Cost	84,448	55,224
Gross Unrealized Gains	41	2
Gross Unrealized Losses	(2)	(25)
Fair Value	84,487	55,201
Cash and restricted cash
Investment [Line Items]
Amortized Cost	1,019	6,883
Fair Value	1,019	6,883
Certificates of deposit
Investment [Line Items]
Amortized Cost	25,990	16,596
Fair Value	$ 25,990	$ 16,596

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