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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Jul. 02, 2021	Jan. 01, 2021
Debt securities available-for-sale:
Amortized Cost	$ 1,352,891	$ 1,349,982
Gross Unrealized Gains	2,855	5,931
Gross Unrealized Losses	(183)	(12)
Fair Value	1,355,563	1,355,901
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	1,736,414	1,532,923
Gross Unrealized Gains	2,855	5,931
Gross Unrealized Losses	(183)	(12)
Fair Value	1,739,086	1,538,842
Commercial paper
Debt securities available-for-sale:
Amortized Cost	716,916	569,456
Gross Unrealized Gains	141	372
Gross Unrealized Losses	0	0
Fair Value	717,057	569,828
Corporate bonds
Debt securities available-for-sale:
Amortized Cost	489,678	543,520
Gross Unrealized Gains	2,630	5,244
Gross Unrealized Losses	(166)	(7)
Fair Value	492,142	548,757
U.S. Treasury and government-sponsored enterprises
Debt securities available-for-sale:
Amortized Cost	132,036	208,326
Gross Unrealized Gains	43	232
Gross Unrealized Losses	(13)	(4)
Fair Value	132,066	208,554
Municipal bonds
Debt securities available-for-sale:
Amortized Cost	14,261	28,680
Gross Unrealized Gains	41	83
Gross Unrealized Losses	(4)	(1)
Fair Value	14,298	28,762
Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	88,511	82,176
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	88,511	82,176
Money market funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	179,306	40,761
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	179,306	40,761
Certificates of deposit
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	115,706	60,004
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 115,706	$ 60,004

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