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Business Segment Information (Tables)
9 Months Ended
Sep. 27, 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 nine months ended September 27, 2014 and September 28, 2013 (in thousands):

    Three Months Ended Nine Months Ended
    September 27, 2014 September 28, 2013 September 27, 2014 September 28, 2013
Product net sales:            
 Waters instrument systems $ 213,122 $ 196,989 $ 595,670 $ 576,981
 Chemistry   77,853   75,413   229,633   223,000
 TA instrument systems   40,190   40,541   111,922   111,887
  Total product sales   331,165   312,943   937,225   911,868
               
Service net sales:            
 Waters service   146,038   130,308   423,155   386,332
 TA service   15,962   14,066   45,094   40,570
  Total service sales   162,000   144,374   468,249   426,902
               
Total net sales $ 493,165 $ 457,317 $ 1,405,474 $ 1,338,770