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Business Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 03, 2015 USD ($) | Sep. 27, 2014 USD ($) | Oct. 03, 2015 USD ($) | Sep. 27, 2014 USD ($)
Entity-Wide Revenue from External Customers [Line Items] |  |  |  |
Number of operating segments |  |  | 2 |
Number of reportable segments |  |  | 1 |
Product sales | $ 336,933 | $ 331,165 | $ 971,842 | $ 937,225
Service sales | 163,645 | 162,000 | 483,880 | 468,249
Total net sales | 500,578 | 493,165 | 1,455,722 | 1,405,474
Waters instrument systems [Member] |  |  |  |
Entity-Wide Revenue from External Customers [Line Items] |  |  |  |
Product sales | 219,196 | 213,122 | 625,276 | 595,670
Chemistry [Member] |  |  |  |
Entity-Wide Revenue from External Customers [Line Items] |  |  |  |
Product sales | 78,173 | 77,853 | 234,095 | 229,633
TA instrument systems [Member] |  |  |  |
Entity-Wide Revenue from External Customers [Line Items] |  |  |  |
Product sales | 39,564 | 40,190 | 112,471 | 111,922
Waters service [Member] |  |  |  |
Entity-Wide Revenue from External Customers [Line Items] |  |  |  |
Service sales | 148,206 | 146,038 | 438,104 | 423,155
TA service [Member] |  |  |  |
Entity-Wide Revenue from External Customers [Line Items] |  |  |  |
Service sales | $ 15,439 | $ 15,962 | $ 45,776 | $ 45,094

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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