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REVENUES (Schedule of Disaggregation of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 1,394,373	$ 1,167,527	$ 4,049,508	$ 3,479,589
Revenues from performance obligations satisfied in previous period	21,600	1,600	15,500	15,000
Transferred over time
Disaggregation of Revenue [Line Items]
Revenues	1,390,186	1,162,937	4,034,321	3,465,406
Transferred at a point of time
Disaggregation of Revenue [Line Items]
Revenues	4,187	4,590	15,187	14,183
Time-and-material
Disaggregation of Revenue [Line Items]
Revenues	1,119,060	968,167	3,248,166	2,893,314
Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	268,099	191,515	778,260	563,490
Licensing and other revenues
Disaggregation of Revenue [Line Items]
Revenues	7,214	7,845	23,082	22,785
Financial Services
Disaggregation of Revenue [Line Items]
Revenues	337,801	254,635	980,079	741,740
Consumer Goods, Retail & Travel
Disaggregation of Revenue [Line Items]
Revenues	276,027	251,125	799,589	762,582
Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	212,156	178,073	606,900	520,327
Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	167,630	167,394	504,570	503,474
Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	159,194	142,334	470,653	422,627
Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	241,565	173,966	687,717	528,839
Americas
Disaggregation of Revenue [Line Items]
Revenues	808,630	697,167	2,390,348	2,081,286
EMEA
Disaggregation of Revenue [Line Items]
Revenues	555,739	444,867	1,577,663	1,325,435
APAC
Disaggregation of Revenue [Line Items]
Revenues	30,004	25,493	81,497	72,868
Americas
Disaggregation of Revenue [Line Items]
Revenues	799,869	704,613	2,364,437	2,107,971
Americas | Transferred over time
Disaggregation of Revenue [Line Items]
Revenues	795,809	701,014	2,349,990	2,097,251
Americas | Transferred at a point of time
Disaggregation of Revenue [Line Items]
Revenues	4,060	3,599	14,447	10,720
Americas | Time-and-material
Disaggregation of Revenue [Line Items]
Revenues	662,650	596,111	1,957,852	1,793,852
Americas | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	131,497	102,239	387,803	296,602
Americas | Licensing and other revenues
Disaggregation of Revenue [Line Items]
Revenues	5,722	6,263	18,782	17,517
Americas | Financial Services
Disaggregation of Revenue [Line Items]
Revenues	150,573	129,339	448,475	377,000
Americas | Consumer Goods, Retail & Travel
Disaggregation of Revenue [Line Items]
Revenues	122,673	107,866	356,090	339,556
Americas | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	143,191	131,145	423,163	392,600
Americas | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	116,848	115,121	348,912	332,602
Americas | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	124,943	120,659	375,859	362,983
Americas | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	141,641	100,483	411,938	303,230
Americas | Americas
Disaggregation of Revenue [Line Items]
Revenues	757,980	669,582	2,251,226	2,002,942
Americas | EMEA
Disaggregation of Revenue [Line Items]
Revenues	41,278	34,679	112,100	103,220
Americas | APAC
Disaggregation of Revenue [Line Items]
Revenues	611	352	1,111	1,809
Europe
Disaggregation of Revenue [Line Items]
Revenues	594,504	462,914	1,685,071	1,371,618
Europe | Transferred over time
Disaggregation of Revenue [Line Items]
Revenues	594,377	461,923	1,684,331	1,368,155
Europe | Transferred at a point of time
Disaggregation of Revenue [Line Items]
Revenues	127	991	740	3,463
Europe | Time-and-material
Disaggregation of Revenue [Line Items]
Revenues	456,410	372,056	1,290,314	1,099,462
Europe | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	136,602	89,276	390,457	266,888
Europe | Licensing and other revenues
Disaggregation of Revenue [Line Items]
Revenues	1,492	1,582	4,300	5,268
Europe | Financial Services
Disaggregation of Revenue [Line Items]
Revenues	187,228	125,296	531,604	364,740
Europe | Consumer Goods, Retail & Travel
Disaggregation of Revenue [Line Items]
Revenues	153,354	143,259	443,499	423,026
Europe | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	68,965	46,928	183,737	127,727
Europe | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	50,782	52,273	155,658	170,872
Europe | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	34,251	21,675	94,794	59,644
Europe | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	99,924	73,483	275,779	225,609
Europe | Americas
Disaggregation of Revenue [Line Items]
Revenues	50,650	27,585	139,122	78,344
Europe | EMEA
Disaggregation of Revenue [Line Items]
Revenues	514,461	410,188	1,465,563	1,222,215
Europe | APAC
Disaggregation of Revenue [Line Items]
Revenues	$ 29,393	$ 25,141	$ 80,386	$ 71,059

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