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Segment Reporting (Summary Of Revenue By Product And Service Category) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 491,976 | $ 448,308 | $ 1,462,937 | $ 1,332,427
Revenue, Reclassified Between Segments | 400 |  | 1,100 |
CAG Diagnostics Recurring Revenue [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 364,937 | 324,603 | 1,091,936 | 969,097
IDEXX Vetlab Consumables [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 129,434 | 113,964 | 385,081 | 336,493
Rapid Assay Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 50,924 | 48,720 | 159,085 | 147,583
Reference Laboratory Diagnostic And Consulting Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 167,851 | 146,672 | 498,218 | 440,514
CAG Diagnostics Service And Accessories [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 16,728 | 15,247 | 49,552 | 44,507
CAG Diagnostic Capital - Instruments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 29,119 | 31,255 | 83,018 | 86,063
Veterinary Software, Services and Diagnostic Imaging Systems [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 32,630 | 29,430 | 94,907 | 87,990
CAG Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 426,686 | 385,288 | 1,269,861 | 1,143,150
Water Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 31,030 | 27,862 | 85,531 | 79,243
LPD Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 28,396 | 29,799 | 91,266 | 93,511
Other Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 5,864 | $ 5,359 | $ 16,279 | $ 16,523

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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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