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Revenue Recognition (Disaggregation of Revenue by Major Product and Service Categories) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 777,707	$ 626,336
CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	692,767	551,996
Water segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	34,040	34,149
LPD segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	39,270	34,154
Other segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	11,630	6,037
Cag Diagnostics recurring revenue | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	617,280	487,925
IDEXX VetLab consumables | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	246,092	188,713
Rapid assay products | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	69,611	57,430
Reference laboratory diagnostic and consulting services | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	275,781	220,261
CAG Diagnostics services and accessories | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	25,796	21,521
CAG Diagnostics capital - instruments | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	31,190	23,833
Veterinary software, services and diagnostic imaging systems | CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 44,297	$ 40,238

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