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Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) Segment | Jul. 01, 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 | $ 10,735 |  |  | $ 10,735 |  |  | $ 15,960
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Revenue recognized | 2,788 |  |  | 30,113 |  |  |
Cumulative-effect adjustment to increase retained earnings | 361,262 |  |  | 361,262 |  |  | 342,893
Reclassification from operating income | 19,735 | $ 11,660 |  | 36,399 | $ 23,910 |  |
Reclassification to other expense, net | $ 245 | 217 |  | $ 491 | 421 |  |
Future lease payments due after next fiscal year |  |  |  |  |  |  | $ 8,100
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 |  | $ (217) |  |  | $ (421) |  |
Reclassification to other expense, net |  |  | $ 204 |  |  |  |
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 | 94.00% |  |  | 95.00% |  |  |
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 | 6.00% |  |  | 5.00% |  |  |

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