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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 29, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 29, 2019 USD ($) Segment | Jun. 30, 2018 USD ($) | Dec. 30, 2018 | Dec. 29, 2018 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Number of reportable segments | Segment |  |  | 3 |  |  |
Bank guarantees, expiration period |  |  | 12 months |  |  |
Banker's acceptance drafts, maturity period |  |  | 6 months |  |  |
Banker's acceptance drafts | $ 7,706 |  | $ 7,706 |  |  | $ 7,976
Revenue recognized | $ 4,427 | $ 2,788 | $ 23,522 | $ 30,113 |  |
Assets | ASU No. 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption, percent |  |  |  |  | 2.30% |
Liabilities | ASU No. 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption, percent |  |  |  |  | 4.80% |

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