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STOCK-BASED COMPENSATION (Equity Plans) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 3 Months Ended
Jan. 11, 2012
Dec. 31, 2014
Jun. 30, 2013
2012 Directors Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized to be reserved for issuance (in shares) 600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= epam_NonEmployeeDirectorCompensationPlanTwentyTwelveMember
   
2012 Directors Plan expiration period (in years) 10 years    
2012 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares available for issuance (in shares)   4,785,761us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= epam_LongTermIncentivePlanTwentyTwelveMember
 
2006 Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock shares subject to outstanding awards that expire or terminate that are available for awards to be granted (in shares)   1,743,034epam_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesAvailableForGrantAdditionalSharesAuthorizedInPeriod
/ us-gaap_PlanNameAxis
= epam_LongTermIncentivePlanTwentyZeroSixMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
2006 Plan | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options issued expiration period (in years)   10 years  
Empathy Lab, LLC      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested common stock shares issued (in shares)     1,483us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ dei_LegalEntityAxis
= epam_EmpathyLabLLCMember
Percentage of restricted stock vested     33.33%epam_PercentageOfRestrictedStockVested
/ dei_LegalEntityAxis
= epam_EmpathyLabLLCMember
Fair value at grant date     $ 42epam_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue
/ dei_LegalEntityAxis
= epam_EmpathyLabLLCMember