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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2016 USD ($) | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Jan. 03, 2015 USD ($) | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Jan. 02, 2016 USD ($) Segment | Jan. 03, 2015 USD ($) | Dec. 28, 2013 USD ($) | Dec. 31, 2005 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating cycle | 91 days | 91 days | 91 days | 91 days | 98 days | 91 days | 91 days | 91 days | 91 days | 91 days | 91 days | 91 days | 364 days | 371 days | 364 days |
Percentage of completion revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,078 | $ 19,078 | $ 19,758 |
Due from bankers acceptances drafts | $ 8,314 |  |  |  | $ 6,334 |  |  |  |  |  |  |  | 8,314 | 6,334 |  |
Restricted cash | 1,406 |  |  |  | $ 415 |  |  |  |  |  |  |  | 1,406 | 415 |  |
Cost of goods and services sold, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,814 | 5,661 | 5,088 |
Weighted average useful life of acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 11 years |  |  |
Amortization expense of acquired intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,007 | 5,528 | $ 4,687 |
Estimated Future Amortization Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 4,470 |  |  |  |  |  |  |  |  |  |  |  | 4,470 |  |  |
2017 | 4,328 |  |  |  |  |  |  |  |  |  |  |  | 4,328 |  |  |
2018 | 4,193 |  |  |  |  |  |  |  |  |  |  |  | 4,193 |  |  |
2019 | 3,815 |  |  |  |  |  |  |  |  |  |  |  | 3,815 |  |  |
2020 | 3,481 |  |  |  |  |  |  |  |  |  |  |  | 3,481 |  |  |
Thereafter | $ 9,645 |  |  |  |  |  |  |  |  |  |  |  | 9,645 |  |  |
Johnson tradename |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,100 | $ 8,100 |  | $ 8,100
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating cycle |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating cycle |  |  |  |  |  |  |  |  |  |  |  |  |  | 371 days |  |

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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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