REVENUES (Schedule of Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Change in Contract with Customer, Liability [Abstract]
Revenue recognized	$ 26,400	$ 14,100	$ 69,700	$ 40,300
Major Customer
Change in Contract with Customer, Liability [Abstract]
Contract liabilities	22,400		22,400		$ 51,200
Balance Sheet Location [Axis]: us-gaap:AccruedLiabilitiesAndOtherLiabilities
Change in Contract with Customer, Liability [Abstract]
Contract liabilities	64,361		64,361		104,219
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Change in Contract with Customer, Liability [Abstract]
Contract assets	1,654		1,654		246
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Change in Contract with Customer, Liability [Abstract]
Contract liabilities	574		574		674
Balance Sheet Location [Axis]: epam:TradeReceivablesAndContractAssetsAfterAllowanceForCreditLossCurrent
Change in Contract with Customer, Liability [Abstract]
Contract assets	$ 76,496		$ 76,496		$ 58,513