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Revenue Recognition (Disaggregation of Revenue by Major Product and Service Categories) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 2,706,655 | $ 2,406,908 | $ 2,213,242
CAG segment revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,385,765 | 2,119,183 | 1,935,428
CAG segment revenue | CAG Diagnostics recurring revenue: |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,113,839 | 1,828,329 | 1,654,530
CAG segment revenue | IDEXX VetLab consumables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 824,376 | 693,360 | 617,237
CAG segment revenue | Rapid assay products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 253,018 | 232,149 | 217,541
CAG segment revenue | Reference laboratory diagnostic and consulting services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 946,268 | 822,497 | 746,794
CAG segment revenue | CAG Diagnostics services and accessories |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 90,177 | 80,323 | 72,958
CAG segment revenue | CAG Diagnostics capital - instruments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 108,950 | 132,685 | 134,264
CAG segment revenue | Veterinary software, services and diagnostic imaging systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 162,976 | 158,169 | 146,634
Water segment revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 128,625 | 132,850 | 125,198
LPD segment revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 145,845 | 132,635 | 130,581
Other segment revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 46,420 | $ 22,240 | $ 22,035

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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