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Fair Value of Financial Instruments - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Jan. 01, 2022
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Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | $ 383,736 | $ 545,874
Fair value of available-for-sale securities, continuous loss position for twelve months or greater | 285,676 | 5,306
Total fair value of available-for-sale securities, continuous loss position | 669,412 | 551,180
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (5,923) | (2,201)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (7,631) | (1,021)
Available-for-sale securities, total gross unrealized losses | (13,554) | (3,222)
Government debt securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 76,651 | 126,957
Fair value of available-for-sale securities, continuous loss position for twelve months or greater | 100,209 |
Total fair value of available-for-sale securities, continuous loss position | 176,860 | 126,957
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (626) | (750)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (3,541) |
Available-for-sale securities, total gross unrealized losses | (4,167) | (750)
Corporate debt securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for less than twelve months | 307,085 | 418,917
Fair value of available-for-sale securities, continuous loss position for twelve months or greater | 185,467 | 326
Total fair value of available-for-sale securities, continuous loss position | 492,552 | 419,243
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for less than 12 months, gross unrealized losses | (5,297) | (1,451)
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses | (4,090) | (1)
Available-for-sale securities, total gross unrealized losses | $ (9,387) | (1,452)
Auction rate securities |  |
Continuous unrealized loss position, Fair Value |  |
Fair value of available-for-sale securities, continuous loss position for twelve months or greater |  | 4,980
Total fair value of available-for-sale securities, continuous loss position |  | 4,980
Continuous unrealized loss position, Gross Unrealized Losses |  |
Available-for-sale securities, continuous loss position for 12 months or greater, gross unrealized losses |  | (1,020)
Available-for-sale securities, total gross unrealized losses |  | $ (1,020)

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