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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Jun. 28, 2019	Dec. 28, 2018	Jun. 29, 2018	Dec. 29, 2017
Investment [Line Items]
Amortized Cost	$ 1,132,684	$ 828,843
Amortized Cost	370,889	315,875	$ 250,011	$ 188,314
Gross Unrealized Gains	3,056	182
Gross Unrealized Losses	(41)	(883)
Fair Value	1,135,699	828,142
Total cash and investments, amortized cost	1,157,987	852,322
Total cash and investments, fair value	1,161,002	851,621
Money market funds
Investment [Line Items]
Amortized Cost	54,457	47,744
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	54,457	47,744
Commercial paper
Investment [Line Items]
Amortized Cost	406,238	381,134
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	406,238	381,133
Corporate bonds
Investment [Line Items]
Amortized Cost	559,906	344,741
Gross Unrealized Gains	2,885	180
Gross Unrealized Losses	(41)	(857)
Fair Value	562,750	344,064
U.S. Treasury and government sponsored enterprises
Investment [Line Items]
Amortized Cost	112,083	55,224
Gross Unrealized Gains	171	2
Gross Unrealized Losses	0	(25)
Fair Value	112,254	55,201
Cash and restricted cash
Investment [Line Items]
Amortized Cost	2,311	6,883
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,311	6,883
Certificates of deposit
Investment [Line Items]
Amortized Cost	22,992	16,596
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 22,992	$ 16,596

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