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Fair Value of Financial Instruments - Auction rate securities (Details) | Jan. 01, 2022 USD ($) item Y | Jan. 02, 2021 USD ($) | Dec. 28, 2019 USD ($)
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Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Fair value balance at the end of the period | $ 4,980,000 | $ 5,340,000 | $ 5,647,000
Weighted Average | Expected holding period | Discounted cash flow |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Unobservable Input | 10 |  |
Auction rate securities | Significant Unobservable Inputs (Level 3) | Weighted Average | Estimated yield | Discounted cash flow |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Unobservable Input | item | 0.0107 |  |
Auction rate securities | Significant Unobservable Inputs (Level 3) | Weighted Average | Expected holding period | Discounted cash flow |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Unobservable Input | Y | 10 |  |
Auction rate securities | Significant Unobservable Inputs (Level 3) | Weighted Average | Estimated discount rate | Discounted cash flow |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Unobservable Input | item | 0.0245 |  |
Auction rate securities | Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Fair value balance at the end of the period | $ 4,980,000 |  |

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