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Document And Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2018
Sep. 06, 2018
Dec. 31, 2017
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Registrant Name NET 1 UEPS TECHNOLOGIES INC    
Entity Central Index Key 0001041514    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Trading Symbol ueps    
Entity Public Float     $ 387,520,188
Entity Common Stock, Shares Outstanding   56,369,737