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ACQUISITIONS (Estimated Fair Values) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 05, 2014 | Apr. 30, 2014 | Jun. 06, 2014
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 57,417,000 us-gaap_Goodwill | $ 22,268,000 us-gaap_Goodwill | $ 22,698,000 us-gaap_Goodwill |  |  |
Netsoft |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Trade receivables and other current assets | 788,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 788,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Property and equipment and other long-term assets | 52,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 52,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Deferred tax asset | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 351,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Acquired intangible assets | 1,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 1,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Goodwill | 2,749,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 2,776,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Total assets acquired | 5,289,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 5,667,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Accounts payable and accrued expenses | 69,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 69,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Deferred revenue | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Due to employees | 0 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 0 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Deferred tax liability | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Total liabilities assumed | 69,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 69,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Net assets acquired | 5,220,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 5,598,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Jointech |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 871,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 871,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Trade receivables and other current assets | 784,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 784,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Property and equipment and other long-term assets | 338,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 338,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Deferred tax asset | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Acquired intangible assets | 22,485,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 25,744,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Goodwill | 17,404,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 11,033,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Total assets acquired | 41,882,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 38,770,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Accounts payable and accrued expenses | 728,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 728,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Deferred revenue | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Due to employees | 1,254,000 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 1,254,000 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Deferred tax liability | 3,112,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Total liabilities assumed | 5,094,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 1,982,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Net assets acquired | 36,788,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 36,788,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
GGA |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Trade receivables and other current assets | 5,471,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 5,157,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Property and equipment and other long-term assets | 444,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 444,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Deferred tax asset | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 4,463,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Acquired intangible assets | 10,959,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 10,959,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Goodwill | 12,115,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 6,496,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Total assets acquired | 28,989,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 27,519,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Accounts payable and accrued expenses | 2,593,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 2,593,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Deferred revenue | 104,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Due to employees | 0 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 0 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Deferred tax liability | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Total liabilities assumed | 2,697,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 2,593,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Net assets acquired | 26,292,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 24,926,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Great Fridays |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 259,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Trade receivables and other current assets | 1,825,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Property and equipment and other long-term assets | 262,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Deferred tax asset | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Acquired intangible assets | 5,747,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Goodwill | 6,947,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Total assets acquired | 15,040,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Accounts payable and accrued expenses | 872,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Deferred revenue | 317,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Due to employees | 624,000 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Deferred tax liability | 1,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Total liabilities assumed | 3,013,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Net assets acquired | 12,027,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
As Originally Reported |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 1,130,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Trade receivables and other current assets | 8,554,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Property and equipment and other long-term assets | 1,096,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Deferred tax asset | 4,814,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Acquired intangible assets | 44,150,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Goodwill | 27,252,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Total assets acquired | 86,996,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Accounts payable and accrued expenses | 4,262,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Deferred revenue | 317,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Due to employees | 1,878,000 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Deferred tax liability | 1,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Total liabilities assumed | 7,657,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Net assets acquired | 79,339,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_TransactionTotalJanuarythroughNovemberMember |  |  |  |  |
Total |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 1,130,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Trade receivables and other current assets | 8,868,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Property and equipment and other long-term assets | 1,096,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Deferred tax asset | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Acquired intangible assets | 40,891,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Goodwill | 39,215,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Total assets acquired | 91,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Accounts payable and accrued expenses | 4,262,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Deferred revenue | 421,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Due to employees | 1,878,000 epam_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDueToEmployees / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Deferred tax liability | 4,312,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Total liabilities assumed | 10,873,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |
Net assets acquired | $ 80,327,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = epam_NetsoftJointechGGAGreatFridaysMember |  |  |  |  |

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