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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Sep. 27, 2019	Dec. 28, 2018	Sep. 28, 2018	Dec. 29, 2017
Investment [Line Items]
Investments, available-for-sale, Amortized Cost	$ 1,214,736	$ 828,843
Investments available-for-sale, Gross Unrealized Gains	3,692	182
Investments available-for-sale, Gross Unrealized Losses	(91)	(883)
Investments available-for-sale, Fair Value	1,218,337	828,142
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows	243,317	315,875	$ 355,227	$ 188,314
Total cash and investments, Amortized Cost	1,244,826	852,322
Total cash and investments, Gross Unrealized Gains	3,695	182
Total cash and investments, Gross Unrealized Losses	(91)	(883)
Total cash and investments, Fair Value	1,248,430	851,621
Money market funds
Investment [Line Items]
Investments, available-for-sale, Amortized Cost	26,641	47,744
Investments available-for-sale, Gross Unrealized Gains	0	0
Investments available-for-sale, Gross Unrealized Losses	0	0
Investments available-for-sale, Fair Value	26,641	47,744
Commercial paper
Investment [Line Items]
Investments, available-for-sale, Amortized Cost	332,239	381,134
Investments available-for-sale, Gross Unrealized Gains	0	0
Investments available-for-sale, Gross Unrealized Losses	0	(1)
Investments available-for-sale, Fair Value	332,239	381,133
Corporate bonds
Investment [Line Items]
Investments, available-for-sale, Amortized Cost	703,325	344,741
Investments available-for-sale, Gross Unrealized Gains	3,549	180
Investments available-for-sale, Gross Unrealized Losses	(67)	(857)
Investments available-for-sale, Fair Value	706,807	344,064
U.S. Treasury and government sponsored enterprises
Investment [Line Items]
Investments, available-for-sale, Amortized Cost	152,531	55,224
Investments available-for-sale, Gross Unrealized Gains	143	2
Investments available-for-sale, Gross Unrealized Losses	(24)	(25)
Investments available-for-sale, Fair Value	152,650	55,201
Cash and restricted cash
Investment [Line Items]
Investments available-for-sale, Gross Unrealized Gains		0
Investments available-for-sale, Gross Unrealized Losses		0
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows	901	6,883
Cash, cash equivalents, and restricted cash, Gross Unrealized Gains	0
Cash, cash equivalents, and restricted cash, Gross Unrealized Losses	0
Cash, restricted cash and certificates of deposit, Fair Value	901	6,883
Certificates of deposit
Investment [Line Items]
Investments available-for-sale, Gross Unrealized Gains		0
Investments available-for-sale, Gross Unrealized Losses		0
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows	29,189	16,596
Cash, cash equivalents, and restricted cash, Gross Unrealized Gains	3
Cash, cash equivalents, and restricted cash, Gross Unrealized Losses	0
Cash, restricted cash and certificates of deposit, Fair Value	$ 29,192	$ 16,596

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