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Cash and Investments (Gross Unrealized Losses) (Details) - USD ($) $ in Thousands | Jan. 01, 2021 | Jan. 03, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 56,299 | $ 17,377
Gross Unrealized Losses | (12) | (8)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 28,445 | 14,529
Gross Unrealized Losses | (7) | (3)
U.S. Treasury and government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 21,989 | 2,848
Gross Unrealized Losses | (4) | $ (5)
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 5,865 |
Gross Unrealized Losses | $ (1) |

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