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Business Segment Information (Tables)
3 Months Ended
Apr. 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 months ended April 1, 2017 and April 2, 2016 (in thousands):

    Three Months Ended
    April 1, 2017 April 2, 2016
Product net sales:      
 Waters instrument systems $ 197,789 $ 188,529
 Chemistry   87,903   84,150
 TA instrument systems   38,604   35,178
  Total product sales   324,296   307,857
         
Service net sales:      
 Waters service   157,734   151,514
 TA service   15,939   15,875
  Total service sales   173,673   167,389
         
Total net sales $ 497,969 $ 475,246