REVENUE (Disaggregation of Revenue by Major Product and Service Categories) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,214,237	$ 1,105,239	$ 3,571,642	$ 3,213,123
Segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,209,632	1,100,775	3,558,413	3,199,734
Segment revenue \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,115,968	1,012,534	3,288,256	2,954,813
Segment revenue \| Water segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	58,836	54,297	167,665	150,619
Segment revenue \| LPD segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	34,828	33,944	102,492	94,302
Segment revenue \| Total CAG Diagnostics recurring revenue \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	967,351	873,273	2,862,377	2,557,535
Segment revenue \| IDEXX VetLab consumables \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	443,245	387,813	1,286,164	1,107,704
Segment revenue \| Rapid assay products \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	89,135	88,638	275,648	272,912
Segment revenue \| Reference laboratory diagnostic and consulting services \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	399,079	362,725	1,191,987	1,074,825
Segment revenue \| CAG Diagnostics services and accessories \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	35,892	34,097	108,578	102,094
Segment revenue \| CAG Diagnostics capital - instruments \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	51,492	51,479	141,115	142,073
Segment revenue \| Total veterinary software, services and diagnostic imaging systems \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	97,125	87,782	284,764	255,205
Segment revenue \| Recurring revenue \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	77,472	70,988	227,351	205,735
Segment revenue \| Systems and hardware \| CAG segment revenue
Disaggregation of Revenue [Line Items]
Total revenue	19,653	16,794	57,413	49,470
Other revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,605	$ 4,464	$ 13,229	$ 13,389