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Business Segment Information (Tables)
3 Months Ended
Apr. 04, 2015
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 4, 2015 and March 29, 2014 (in thousands):

    Three Months Ended
    April 4, 2015 March 29, 2014
Product net sales:      
 Waters instrument systems $ 188,504 $ 176,364
 Chemistry   78,183   75,203
 TA instrument systems   36,186   33,228
  Total product sales   302,873   284,795
         
Service net sales:      
 Waters service   142,981   132,042
 TA service   14,550   13,671
  Total service sales   157,531   145,713
         
Total net sales $ 460,404 $ 430,508