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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 30, 2019 USD ($) Segment | Mar. 31, 2018 USD ($) | Dec. 29, 2018 USD ($) | Dec. 30, 2018
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 | $ 7,772 |  | $ 7,976 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Currency Translation | (7,387) |  | $ (6,829) |
Revenue recognized | $ 19,095 | $ 27,325 |  |
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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