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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jan. 01, 2021
Debt securities available-for-sale:
Amortized Cost	$ 1,534,464	$ 1,349,982
Gross Unrealized Gains	934	5,931
Gross Unrealized Losses	(1,730)	(12)
Fair Value	1,533,668	1,355,901
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	1,855,704	1,532,923
Gross Unrealized Gains	934	5,931
Gross Unrealized Losses	(1,730)	(12)
Fair Value	1,854,908	1,538,842
Commercial paper
Debt securities available-for-sale:
Amortized Cost	945,801	569,456
Gross Unrealized Gains	42	372
Gross Unrealized Losses	(2)	0
Fair Value	945,841	569,828
Corporate bonds
Debt securities available-for-sale:
Amortized Cost	541,774	543,520
Gross Unrealized Gains	876	5,244
Gross Unrealized Losses	(1,672)	(7)
Fair Value	540,978	548,757
U.S. Treasury and government-sponsored enterprises
Debt securities available-for-sale:
Amortized Cost	33,965	208,326
Gross Unrealized Gains	1	232
Gross Unrealized Losses	(21)	(4)
Fair Value	33,945	208,554
Municipal bonds
Debt securities available-for-sale:
Amortized Cost	12,924	28,680
Gross Unrealized Gains	15	83
Gross Unrealized Losses	(35)	(1)
Fair Value	12,904	28,762
Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	135,653	82,176
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	135,653	82,176
Money market funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	66,531	40,761
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	66,531	40,761
Certificates of deposit
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	119,056	60,004
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 119,056	$ 60,004

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