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Cash and Investments (Summary by Security Type) (Details) - USD ($) $ in Thousands	Jan. 01, 2021	Jan. 03, 2020
Debt securities available-for-sale:
Amortized Cost	$ 1,349,982	$ 1,308,351
Gross Unrealized Gains	5,931	4,121
Gross Unrealized Losses	(12)	(8)
Fair Value	1,355,901	1,312,464
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	1,532,923	1,384,510
Gross Unrealized Gains	5,931	4,126
Gross Unrealized Losses	(12)	(8)
Fair Value	1,538,842	1,388,628
Commercial paper
Debt securities available-for-sale:
Amortized Cost	569,456	389,573
Gross Unrealized Gains	372	0
Gross Unrealized Losses	0	0
Fair Value	569,828	389,573
Corporate bonds
Debt securities available-for-sale:
Amortized Cost	543,520	752,295
Gross Unrealized Gains	5,244	3,934
Gross Unrealized Losses	(7)	(3)
Fair Value	548,757	756,226
U.S. Treasury and government-sponsored enterprises
Debt securities available-for-sale:
Amortized Cost	208,326	166,483
Gross Unrealized Gains	232	187
Gross Unrealized Losses	(4)	(5)
Fair Value	208,554	166,665
Municipal bonds
Debt securities available-for-sale:
Amortized Cost	28,680
Gross Unrealized Gains	83
Gross Unrealized Losses	(1)
Fair Value	28,762
Cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	82,176	40,964
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	82,176	40,964
Money market funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	40,761	2,467
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	40,761	2,467
Certificates of deposit
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Amortized Cost	60,004	32,728
Gross Unrealized Gains	0	5
Gross Unrealized Losses	0	0
Fair Value	$ 60,004	$ 32,733

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