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Business Segment Information (Tables)
3 Months Ended
Apr. 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 months ended April 2, 2016 and April 4, 2015 (in thousands):

    Three Months Ended
    April 2, 2016 April 4, 2015
Product net sales:      
 Waters instrument systems $ 188,529 $ 188,504
 Chemistry   84,150   78,183
 TA instrument systems   35,178   36,186
  Total product sales   307,857   302,873
         
Service net sales:      
 Waters service   151,514   142,981
 TA service   15,875   14,550
  Total service sales   167,389   157,531
         
Total net sales $ 475,246 $ 460,404