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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Apr. 02, 2021	Jan. 01, 2021
Debt securities available-for-sale:
Amortized Cost	$ 1,338,545	$ 1,349,982
Gross Unrealized Gains	3,975	5,931
Gross Unrealized Losses	(291)	(12)
Fair Value	1,342,229	1,355,901
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	1,560,382	1,532,923
Gross Unrealized Gains	3,975	5,931
Gross Unrealized Losses	(291)	(12)
Fair Value	1,564,066	1,538,842
Commercial paper
Debt securities available-for-sale:
Amortized Cost	667,071	569,456
Gross Unrealized Gains	219	372
Gross Unrealized Losses	(1)	0
Fair Value	667,289	569,828
Corporate bonds
Debt securities available-for-sale:
Amortized Cost	495,490	543,520
Gross Unrealized Gains	3,609	5,244
Gross Unrealized Losses	(275)	(7)
Fair Value	498,824	548,757
U.S. Treasury and government-sponsored enterprises
Debt securities available-for-sale:
Amortized Cost	148,208	208,326
Gross Unrealized Gains	83	232
Gross Unrealized Losses	(7)	(4)
Fair Value	148,284	208,554
Municipal bonds
Debt securities available-for-sale:
Amortized Cost	27,776	28,680
Gross Unrealized Gains	64	83
Gross Unrealized Losses	(8)	(1)
Fair Value	27,832	28,762
Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	52,757	82,176
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	52,757	82,176
Money market funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	105,775	40,761
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	105,775	40,761
Certificates of deposit
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	63,305	60,004
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 63,305	$ 60,004

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