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Business Segment Information (Tables)
6 Months Ended
Jul. 02, 2016
Business Segment Information [Abstract]  
Revenue from External Customers by Products and Services

Net sales for the Company's products and services are as follows for the three and six months ended July 2, 2016 and July 4, 2015 (in thousands):

    Three Months Ended Six Months Ended
    July 2, 2016 July 4, 2015 July 2, 2016 July 4, 2015
Product net sales:            
 Waters instrument systems $ 231,908 $ 217,576 $ 420,437 $ 406,080
 Chemistry   87,048   77,739   171,198   155,922
 TA instrument systems   40,731   36,721   75,909   72,907
  Total product sales   359,687   332,036   667,544   634,909
               
Service net sales:            
 Waters service   159,775   146,917   311,289   289,898
 TA service   17,098   15,787   32,973   30,337
  Total service sales   176,873   162,704   344,262   320,235
               
Total net sales $ 536,560 $ 494,740 $ 1,011,806 $ 955,144