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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