Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 29, 2018 USD ($) Segment	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | Segment	2
Contract assets	$ 15,741,000	$ 2,374,000
Revenue recognized	36,556,000
Percentage of completion revenue		27,676,000	$ 23,300,000
Advance payments on long-term contracts		2,945,000
Due from bankers acceptances drafts	7,976,000	15,960,000
Restricted cash	$ 287,000	1,421,000	2,082,000
Weighted average useful life of acquired intangible assets	12 years
Amortization expense of acquired intangible assets	$ 14,182,000	11,957,000	8,132,000
Estimated Future Amortization Expense [Abstract]
2019	12,869,000
2020	12,299,000
2021	11,784,000
2022	11,011,000
2023	9,610,000
Thereafter	39,289,000
Goodwill and Intangible Asset Impairment [Abstract]
Goodwill impairment	0	0
Impairment of intangible assets	0	0
Recent Accounting Pronouncements [Abstract]
Retained earnings	393,578,000	342,893,000
Operating income reclassed to other expense	$ 88,598,000	61,625,000	46,642,000
Accounting Standards Update 2017-07
Recent Accounting Pronouncements [Abstract]
Operating income reclassed to other expense		$ (872,000)	$ (1,069,000)
Accounting Standards Update 2016-02 | Minimum | Subsequent event
Recent Accounting Pronouncements [Abstract]
Operating lease, liability				$ 15,500,000
Operating lease, right-of-use asset				18,500,000
Accounting Standards Update 2016-02 | Maximum | Subsequent event
Recent Accounting Pronouncements [Abstract]
Operating lease, liability				17,500,000
Operating lease, right-of-use asset				$ 20,500,000
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Recent Accounting Pronouncements [Abstract]
Retained earnings					$ 119,000
Joint Venture with an Italian Company
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining ownership interest with an option to purchase	50.00%
Italian Company | Joint Venture with an Italian Company
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Ownership interest	50.00%
Point in Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, performance obligation, percentage recognized	91.00%
Over Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, performance obligation, percentage recognized	9.00%