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Fair Value Of Financial Instruments (Narrative) (Details)
R in Millions
1 Months Ended 12 Months Ended 36 Months Ended
Mar. 31, 2019
ZAR (R)
Mar. 31, 2019
USD ($)
Jun. 30, 2019
ZAR (R)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
ZAR (R)
Jun. 30, 2018
USD ($)
Aug. 02, 2017
shares
Derivatives, Fair Value [Line Items]                  
Transfers into or out of Level 3 | $         $ 0        
Minimum [Member]                  
Derivatives, Fair Value [Line Items]                  
Years of significant fluctuation of US Dollar to ZAR exchange rate     3 years 3 years          
Cell C [Member]                  
Derivatives, Fair Value [Line Items]                  
Equity method investment, percentage of ownership interest     0.00%     0.00%      
Adjusted EBITDA             R 3,900.0 $ 284,800,000  
EBITDA multiple             6.75% 6.75%  
Net external debt             R 8.8 $ 641,100,000  
Marketability discount             10.00% 10.00%  
Net1 SA [Member] | Cell C [Member] | Class A [Member]                  
Derivatives, Fair Value [Line Items]                  
Investment shares owned     75,000,000     75,000,000      
Cell C [Member] | Net1 SA [Member] | Class A [Member]                  
Derivatives, Fair Value [Line Items]                  
Investment shares owned                 75,000,000
DNI [Member]                  
Derivatives, Fair Value [Line Items]                  
Long-term liabilities             R 373.6 $ 27,200,000  
Settlement of contingent consideration R 400.0 $ 27,600,000              
Accretion of interest     R 26.4 $ 1,800,000          
DNI [Member] | Maximum [Member]                  
Derivatives, Fair Value [Line Items]                  
DNI contingent consideration     R 400.0     $ 27,600,000      
DNI [Member] | Present Value [Member]                  
Derivatives, Fair Value [Line Items]                  
Long-term liabilities | R             R 400.0