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Business Segment Information (Tables)
6 Months Ended
Jul. 01, 2017
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 1, 2017 and July 2, 2016 (in thousands):

    Three Months Ended Six Months Ended
    July 1, 2017 July 2, 2016 July 1, 2017 July 2, 2016
Product net sales:            
 Waters instrument systems $ 238,548 $ 231,908 $ 436,337 $ 420,437
 Chemistry   90,824   87,048   178,727   171,198
 TA instrument systems   43,466   40,731   82,070   75,909
  Total product sales   372,838   359,687   697,134   667,544
               
Service net sales:            
 Waters service   168,408   159,775   326,142   311,289
 TA service   17,004   17,098   32,943   32,973
  Total service sales   185,412   176,873   359,085   344,262
               
Total net sales $ 558,250 $ 536,560 $ 1,056,219 $ 1,011,806