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IDEXX Retirement And Incentive Savings Plan	12 Months Ended
IDEXX Retirement And Incentive Savings Plan	Dec. 31, 2017
IDEXX Retirement And Incentive Savings Plan [Abstract]
IDEXX Retirement And Incentive Savings Plan	NOTE 21. 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. We match a portion of these contributions, not to exceed 4 percent of participants’ eligible compensation. We matched $13.8 million, $12.5 million, and $11.5 million for the years ended December 31, 2017, 2016 and 2015, 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 2017, 2016 or 2015. 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.