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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Dec. 30, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Number of reportable segments | Segment | 2 |  |
Percentage of completion revenue | $ 27,676,000 | $ 23,300,000 | $ 32,078,000
Advance payments on long-term contracts | 2,945,000 | 5,158,000 |
Due from bankers acceptances drafts | 15,960,000 | 7,852,000 |
Restricted cash | $ 1,421,000 | 2,082,000 |
Weighted average useful life of acquired intangible assets | 12 years |  |
Amortization expense of acquired intangible assets | $ 11,957,000 | 8,132,000 | $ 5,007,000
Estimated Future Amortization Expense [Abstract] |  |  |
2018 | 14,409,000 |  |
2019 | 13,482,000 |  |
2020 | 12,882,000 |  |
2021 | 12,340,000 |  |
2022 | 11,536,000 |  |
Thereafter | 51,482,000 |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |
Goodwill impairment | 0 | 0 |
Impairment of intangible assets | 0 | 0 |
Recent Accounting Pronouncements [Abstract] |  |  |
Reduction to retained earnings | (342,893,000) | $ (321,050,000) |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Minimum | Pro Forma |  |  |
Recent Accounting Pronouncements [Abstract] |  |  |
Reduction to retained earnings | 100,000 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Maximum | Pro Forma |  |  |
Recent Accounting Pronouncements [Abstract] |  |  |
Reduction to retained earnings | $ 300,000 |  |
Joint Venture with an Italian Company |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Ownership interest | 50.00% |  |
Remaining ownership interest with an option to purchase | 50.00% |  |

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- Definition The percentage of completion is determined by comparing the actual costs incurred to date to an estimate of total costs to be incurred on each contract. If a loss is indicated on any contract in process, a provision is made currently for the entire loss. The Company's contracts generally provide for billing of customers upon the attainment of certain milestones specified in each contract. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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