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Business Segment Information (Tables)
9 Months Ended
Oct. 03, 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 and nine months ended October 3, 2015 and September 27, 2014 (in thousands):

    Three Months Ended Nine Months Ended
    October 3, 2015 September 27, 2014 October 3, 2015 September 27, 2014
Product net sales:            
 Waters instrument systems $ 219,196 $ 213,122 $ 625,276 $ 595,670
 Chemistry   78,173   77,853   234,095   229,633
 TA instrument systems   39,564   40,190   112,471   111,922
  Total product sales   336,933   331,165   971,842   937,225
               
Service net sales:            
 Waters service   148,206   146,038   438,104   423,155
 TA service   15,439   15,962   45,776   45,094
  Total service sales   163,645   162,000   483,880   468,249
               
Total net sales $ 500,578 $ 493,165 $ 1,455,722 $ 1,405,474