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Business Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)
Business Segment Information [Line Items]
Number of operating segments			2
Number of reportable segments			1
Product sales	$ 372,838	$ 359,687	$ 697,134	$ 667,544
Service sales	185,412	176,873	359,085	344,262
Total net sales	558,250	536,560	1,056,219	1,011,806
Waters instrument systems [Member]
Business Segment Information [Line Items]
Product sales	238,548	231,908	436,337	420,437
Chemistry [Member]
Business Segment Information [Line Items]
Product sales	90,824	87,048	178,727	171,198
TA instrument systems [Member]
Business Segment Information [Line Items]
Product sales	43,466	40,731	82,070	75,909
Waters service [Member]
Business Segment Information [Line Items]
Service sales	168,408	159,775	326,142	311,289
TA service [Member]
Business Segment Information [Line Items]
Service sales	$ 17,004	$ 17,098	$ 32,943	$ 32,973

X

- 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.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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