IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Contribution match, maximum percent of participants' eligible compensation (as a percent)	5.00%	5.00%	5.00%
Employer contributions	$ 31,000,000.0	$ 30,300,000	$ 28,300,000
Discretionary contributions	0	$ 0	$ 0
Defined benefit plan, benefit obligation	5,700,000
Defined benefit plan, plan assets, amount	15,100,000
Pension expense	$ 1,300,000