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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% |  |  |  |

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