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Fair Value of Financial Instruments - Auction rate securities (Details) - Auction rate securities - Significant Unobservable Inputs (Level 3) $ in Thousands | Sep. 28, 2019 USD ($) item Y | Jun. 29, 2019 USD ($) | Dec. 29, 2018 USD ($)
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Weighted Average | Estimated yield | Discounted cash flow |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Unobservable Input | 0.0359 |  |
Weighted Average | Expected holding period | Discounted cash flow |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Unobservable Input | Y | 10 |  |
Weighted Average | Estimated discount rate | Discounted cash flow |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Unobservable Input | 0.0267 |  |
Recurring |  |  |
Quantitative information for Level 3 Fair Value Measurements Assets |  |  |
Fair value balance at the end of the period | $ | $ 5,715 | $ 5,647 | $ 5,759

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