CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 212,231	$ 180,938	$ 650,521	$ 506,882
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(12,949)	(31,220)	(6,939)	(59,024)
Benefit plans, net of tax expense of $0 and $0 in 2023 and $0 and $(991) in 2022	0	0	0	(5,056)
Reclassification adjustment for benefit plans included in net income, net of tax of $21 and $75 in 2023 and $23 and $74 in 2022	98	118	395	378
Unrealized gain (loss) on Euro-denominated notes, net of tax expense (benefit) of $727 and $152 in 2023 and $1,713 and $3,438 in 2022	2,331	5,495	488	11,028
Unrealized gain (loss) on investments, net of tax expense (benefit) of $0 and $2 in 2023 and $(3) and $(15) in 2022	(1)	(10)	6	(52)
Unrealized gain (loss) on derivative instruments:
Unrealized gain (loss) on foreign currency exchange contracts, net of tax expense (benefit) of $2,765 and $2,785 in 2023 and $4,634 and $10,368 in 2022	7,645	13,490	7,305	26,930
Unrealized gain (loss) on cross currency swaps, net of tax expense (benefit) of $579 and $(361) in 2023 and $1,657 and $3,303 in 2022	1,858	5,319	(1,158)	10,597
Unrealized gain (loss) on interest rate swap, net of tax expense (benefit) of $545 and $1,638 in 2023 and $0 and $0 in 2022	1,749	0	5,254	0
Reclassification adjustments for (gain) loss included in net income, net of tax (expense) benefit of $(701) and $(945) in 2023 and $(2,254) and $(4,441) in 2022	(1,957)	(6,381)	(2,446)	(12,211)
Unrealized gain (loss) on derivative instruments	9,295	12,428	8,955	25,316
Other comprehensive (loss) income, net of tax	(1,226)	(13,189)	2,905	(27,410)
Comprehensive income attributable to IDEXX Laboratories, Inc.	$ 211,005	$ 167,749	$ 653,426	$ 479,472