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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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