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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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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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Amounts receivable from customers on short-term negotiable time drafts drawn on and accepted by the institution (also known as banker's acceptance transactions) that are outstanding on the reporting date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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