| DEI Document | Nov. 07, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Nov. 7, 2019 |
| 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 |
