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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands | Jul. 03, 2020 | Jan. 03, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Investments, available-for-sale, amortized cost | $ 1,021,295 | $ 1,308,351
Investments available-for-sale, gross unrealized gains | 10,386 | 4,121
Investments available-for-sale, gross unrealized losses | (151) | (8)
Investments available-for-sale, fair value | 1,031,530 | 1,312,464
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, amortized cost | 1,529,944 | 1,384,510
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, gross unrealized gains | 10,386 | 4,126
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities, gross unrealized losses | (151) | (8)
Cash, cash equivalents, restricted cash and restricted cash equivalents and available-for-sale debt securities | 1,540,179 | 1,388,628
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments, available-for-sale, amortized cost | 239,685 | 389,573
Investments available-for-sale, gross unrealized gains | 245 | 0
Investments available-for-sale, gross unrealized losses | 0 | 0
Investments available-for-sale, fair value | 239,930 | 389,573
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments, available-for-sale, amortized cost | 663,491 | 752,295
Investments available-for-sale, gross unrealized gains | 9,527 | 3,934
Investments available-for-sale, gross unrealized losses | (150) | (3)
Investments available-for-sale, fair value | 672,868 | 756,226
U.S. Treasury and government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments, available-for-sale, amortized cost | 89,890 | 166,483
Investments available-for-sale, gross unrealized gains | 462 | 187
Investments available-for-sale, gross unrealized losses | 0 | (5)
Investments available-for-sale, fair value | 90,352 | 166,665
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments, available-for-sale, amortized cost | 28,229 |
Investments available-for-sale, gross unrealized gains | 152 |
Investments available-for-sale, gross unrealized losses | (1) |
Investments available-for-sale, fair value | 28,380 |
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost | 52,053 | 40,964
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain | 0 | 0
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss | 0 | 0
Cash, cash equivalents, restricted cash and restricted cash equivalents | 52,053 | 40,964
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost | 404,313 | 2,467
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain | 0 | 0
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss | 0 | 0
Cash, cash equivalents, restricted cash and restricted cash equivalents | 404,313 | 2,467
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents, amortized cost | 52,283 | 32,728
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized gain | 0 | 5
Cash, cash equivalents, restricted cash and restricted cash equivalents, gross unrealized loss | 0 | 0
Cash, cash equivalents, restricted cash and restricted cash equivalents | $ 52,283 | $ 32,733

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