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Summary of Significant Accounting Policies - (Marketable Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2022 | Dec. 29, 2021 | Dec. 30, 2020
Investment [Line Items] |  |  |
Marketable securities | $ 1,746 | $ 2,551 |
Unrealized gain (loss) on marketable securities | (2,200) | 2,200 | $ 1,800
Investments |  |  |
Investment [Line Items] |  |  |
Unrealized gain (loss) on marketable securities | (200) | 100 | $ (100)
Aggregated Cost |  |  |
Investment [Line Items] |  |  |
Marketable securities | 1,900 | 2,500 |
Estimate of Fair Value Measurement |  |  |
Investment [Line Items] |  |  |
Marketable securities | $ 1,700 | $ 2,600 |

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- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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