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Fair Value of Financial Instruments - Activity in Level 3 financial instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Fair value assets reconciliation of changes |  |
Balance at the beginning of the period | $ 5,681 | $ 5,196
Gain included in other comprehensive income (loss) | 78 | 485
Balance at the end of the period | 5,759 | 5,681
Recurring | Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |
Fair value liabilities reconciliation of changes |  |
Balance at the beginning of the period | 0 | 0
Issues |  | 3,829
Reclassification to acquisition-related liabilities |  | (3,380)
Gain recognized in selling, general and administrative expenses |  | 449
Balance at the end of the period |  | 0
Convertible Senior Notes |  |
Fair value liabilities reconciliation of changes |  |
Fair value of debt | $ 419,000 | $ 466,200

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