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IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan | Switzerland      
Retirement And Incentive Savings Plan [Line Items]      
Defined benefit plan, benefit obligation $ 5,600,000    
Defined benefit plan, plan assets, amount 14,400,000    
Pension expense $ 1,100,000    
401(k) Plan      
Retirement And Incentive Savings Plan [Line Items]      
Contribution match, maximum percent of participants' eligible compensation (percent) 5.00% 5.00% 5.00%
Employer contributions $ 30,300,000 $ 28,300,000 $ 25,800,000
Discretionary contributions $ 0 $ 0 $ 0