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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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