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Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 27, 2014
Segment
Sep. 28, 2013
Dec. 28, 2013
Accounting Policies [Abstract]      
Number of reportable segments 2    
Cash Flow, Noncash Investing Activities Disclosure [Abstract]      
Fair value of assets acquired $ 5,635 $ 22,688  
Cash paid for acquired businesses (3,648) (15,332)  
Liabilities assumed of acquired businesses 1,987 7,356  
Cash Flow, Noncash Financing Activities Disclosure [Abstract]      
Issuance of Company Common Stock 2,957 2,515  
Dividends Declared but Unpaid 1,634 1,393  
Restricted Cash [Abstract]      
Restricted Cash 598   168
Banker's Acceptance Drafts [Abstract]      
Banker's acceptance drafts 9,988   10,765
Inventories [Abstract]      
Raw Materials and Supplies 24,063   20,836
Work in Process 15,598   21,051
Finished Goods 18,046   20,918
Inventories 57,707   62,805
Intangible Assets, Net (Excluding Goodwill) [Abstract]      
Indefinite-Lived Intangible Assets 8,100   8,100
Finite-Lived Intangible Assets, Net [Abstract]      
Finite-Lived Intangible Assets, Gross 71,193   69,409
Accumulated Amortization (34,668)   (30,373)
Finite-Lived Intangible Assets, Net 35,644   39,750
Finite-Lived Intangible Assets, Translation and Purchase Accounting Adjustments [Abstract]      
Currency Translation (881)   714
Changes in the carrying amount of accrued warranty costs [Roll Forward]      
Balance at beginning of period 4,571 4,462 4,462
Provision 1,681 969  
Usage (2,016) (1,366)  
Acquired 0 138  
Currency translation (190) 62  
Balance at end of period 4,046 4,265 4,571
Total Intangible Assets, Net $ 43,744   $ 47,850