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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 29, 2018 USD ($) Segment | Sep. 30, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 30, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |  |
Bank guarantees, expiration period |  |  | 12 months |  |  |
Banker's acceptance drafts, maturity period |  |  | 6 months |  |  |
Banker's acceptance drafts | $ 14,193 |  | $ 14,193 |  |  | $ 15,960
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue recognized | 5,787 |  | 35,900 |  |  |
Cumulative-effect adjustment to increase retained earnings | 377,602 |  | 377,602 |  |  | $ 342,893
Reclassification from operating income | 27,375 | $ 19,674 | 63,774 | $ 43,584 |  |
Reclassification to other expense, net | 245 | 216 | 736 | 637 |  |
ASU No. 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment to increase retained earnings |  |  |  |  | $ 119 |
ASU No. 2017-07 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification from operating income |  | $ (216) |  | $ (637) |  |
Reclassification to other expense, net | $ 216 |  | $ 637 |  |  |
Timing Of Transfer Of Good Or Service [Member] | Point in Time [Member] | Revenue from Contract with Customer [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Concentration risk percentage | 90.00% |  | 93.00% |  |  |
Timing Of Transfer Of Good Or Service [Member] | Over Time [Member] | Revenue from Contract with Customer [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Concentration risk percentage | 10.00% |  | 7.00% |  |  |

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