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IDEXX Retirement and Incentive Savings Plan	12 Months Ended
IDEXX Retirement and Incentive Savings Plan	Dec. 31, 2019
Defined Contribution Plan [Abstract]
IDEXX Retirement and Incentive Savings Plan	IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN We have established the IDEXX Retirement and Incentive Savings Plan (the “401(k) Plan”). U.S. employees eligible to participate in the 401(k) Plan may contribute specified percentages of their salaries. Beginning January 1, 2018, we matched a portion of these contributions, not to exceed 5% of participants’ eligible compensation. Prior to January 1, 2018, we matched a portion of these contributions, not to exceed 4% of participants' eligible compensation. We matched $21.1 million, $19.0 million, and $13.8 million for the years ended December 31, 2019, 2018 and 2017, respectively. In addition, we may make contributions to the 401(k) Plan at the discretion of the Board of Directors. There were no discretionary contributions in 2019, 2018 or 2017. We also have established defined contribution plans for regional employees in Europe and in Canada. With respect to these plans, our contributions over the past three years have not been material.