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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Jan. 01, 2021
Debt securities available-for-sale:
Amortized Cost	$ 1,459,665	$ 1,349,982
Gross Unrealized Gains	2,102	5,931
Gross Unrealized Losses	(127)	(12)
Fair Value	1,461,640	1,355,901
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	1,794,137	1,532,923
Gross Unrealized Gains	2,102	5,931
Gross Unrealized Losses	(127)	(12)
Fair Value	1,796,112	1,538,842
Commercial paper
Debt securities available-for-sale:
Amortized Cost	886,323	569,456
Gross Unrealized Gains	73	372
Gross Unrealized Losses	0	0
Fair Value	886,396	569,828
Corporate bonds
Debt securities available-for-sale:
Amortized Cost	503,707	543,520
Gross Unrealized Gains	1,967	5,244
Gross Unrealized Losses	(126)	(7)
Fair Value	505,548	548,757
U.S. Treasury and government-sponsored enterprises
Debt securities available-for-sale:
Amortized Cost	58,965	208,326
Gross Unrealized Gains	21	232
Gross Unrealized Losses	(1)	(4)
Fair Value	58,985	208,554
Municipal bonds
Debt securities available-for-sale:
Amortized Cost	10,670	28,680
Gross Unrealized Gains	41	83
Gross Unrealized Losses	0	(1)
Fair Value	10,711	28,762
Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	80,828	82,176
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	80,828	82,176
Money market funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	119,538	40,761
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	119,538	40,761
Certificates of deposit
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	134,106	60,004
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 134,106	$ 60,004

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