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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 USD ($) | Jun. 27, 2020 USD ($) | Sep. 28, 2019 USD ($) | Sep. 26, 2020 USD ($) Segment | Sep. 28, 2019 USD ($) | Dec. 28, 2019 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  | 3 |  |
Bank guarantees, expiration period |  |  |  | 12 months |  |
Intangible assets acquired |  | $ 3,907 |  |  |  |
Revenue recognized | $ 1,656 |  | $ 4,780 | $ 28,522 | $ 28,302 |
Revenue, remaining performance obligation, amount | 5,295 |  |  | $ 5,295 |  |
Banker's acceptance drafts, maturity period |  |  |  | 6 months |  |
Banker's acceptance drafts | $ 4,423 |  |  | $ 4,423 |  | $ 5,230

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