| DEI Document | May 07, 2020 | Nov. 07, 2019 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | May 7, 2020 | |
| Entity Registrant Name | EPAM SYSTEMS, INC. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 1-35418 | |
| Entity Tax Identification Number | 22-3536104 | |
| Entity Address, Address Line One | 41 University Drive | |
| Entity Address, Address Line Two | Suite 202 | |
| Entity Address, City or Town | Newtown | |
| Entity Address, State or Province | PA | |
| Entity Address, Postal Zip Code | 18940 | |
| City Area Code | 267 | |
| Local Phone Number | 759-9000 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Emerging Growth Company | false | |
| Amendment Flag | false | |
| Entity Central Index Key | 0001352010 | |
| Title of 12(b) Security | Common Stock, par value $0.001 per share | |
| Trading Symbol | EPAM | |
| Security Exchange Name | NYSE |
