v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
Apr. 30, 2019
Document Documentand Entity Information [Abstract]    
Entity Registrant Name EPAM Systems, Inc.  
Trading Symbol EPAM  
Entity Central Index Key 0001352010  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Common Stock, Shares Outstanding   54,631,565
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Document Period End Date Mar. 31, 2019  
Document Type 10-Q  
Amendment Flag false