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Cash and Investments (Summary by Security Type) (Details) - USD ($) $ in Thousands	Jan. 03, 2020	Dec. 28, 2018
Investment securities available-for-sale:
Amortized Cost	$ 1,308,351	$ 781,099
Gross Unrealized Gains	4,121	182
Gross Unrealized Losses	(8)	(883)
Fair Value	1,312,464	780,398
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Total, Amortized Cost	1,384,510	852,322
Cash, Cash Equivalents, Restricted Cash And Restricted Cash Equivalents And Available For Sale Debt Securities, Accumulated Gross Unrealized Gain, Before Tax	4,126
Cash, Cash Equivalents, Restricted Cash And Restricted Cash Equivalents And Available For Sale, Debt Securities, Accumulated Gross Unrealized Loss, Before Tax	(8)
Total, Fair Value	1,388,628	851,621
Commercial paper
Investment securities available-for-sale:
Amortized Cost	389,573	381,134
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	389,573	381,133
Corporate bonds
Investment securities available-for-sale:
Amortized Cost	752,295	344,741
Gross Unrealized Gains	3,934	180
Gross Unrealized Losses	(3)	(857)
Fair Value	756,226	344,064
U.S. Treasury and government sponsored enterprises
Investment securities available-for-sale:
Amortized Cost	166,483	55,224
Gross Unrealized Gains	187	2
Gross Unrealized Losses	(5)	(25)
Fair Value	166,665	55,201
Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	40,964	6,883
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	40,964	6,883
Money market funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	2,467	47,744
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,467	47,744
Certificates of deposit
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	32,728	16,596
Gross Unrealized Gains	5	0
Gross Unrealized Losses	0	0
Fair Value	$ 32,733	$ 16,596

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