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Business Segment Information (Tables)
6 Months Ended
Jun. 28, 2014
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 June 28, 2014 and June 29, 2013 (in thousands):

    Three Months Ended Six Months Ended
    June 28, 2014 June 29, 2013 June 28, 2014 June 29, 2013
Product net sales:            
 Waters instrument systems $ 206,184 $ 195,468 $ 382,548 $ 379,992
 Chemistry   76,577   74,454   151,780   147,587
 TA instrument systems   38,504   35,289   71,732   71,346
  Total product sales   321,265   305,211   606,060   598,925
               
Service net sales:            
 Waters service   145,075   132,256   277,117   256,024
 TA service   15,461   13,648   29,132   26,504
  Total service sales   160,536   145,904   306,249   282,528
               
Total net sales $ 481,801 $ 451,115 $ 912,309 $ 881,453