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Fair Value Of Financial Instruments (Narrative) (Details)
R in Millions
3 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
ZAR (R)
shares
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2018
ZAR (R)
contract
Jun. 30, 2018
USD ($)
contract
Derivatives, Fair Value [Line Items]            
Other payables       $ 82,292,000   $ 47,994,000 [1]
Transfers into or out of Level 3 $ 0 $ 0        
Minimum [Member]            
Derivatives, Fair Value [Line Items]            
Years of significant fluctuation of US Dollar to ZAR exchange rate 3 years          
Foreign Exchange Contracts [Member]            
Derivatives, Fair Value [Line Items]            
Outstanding foreign exchange contracts | contract         0 0
Cell C [Member]            
Derivatives, Fair Value [Line Items]            
Equity method investment, percentage of ownership interest     14.00% 14.00%    
Adjusted EBITDA       $ 275,800,000 R 3,900.0  
Net external debt       $ 622,300,000 R 8,800.0  
Percentage of direct shareholding     15.00% 15.00% 15.00% 15.00%
EBITDA multiple         6.75% 6.75%
Marketability discount         10.00% 10.00%
Cell C [Member] | EBITDA Multiple [Member]            
Derivatives, Fair Value [Line Items]            
Impact of increase and decrease to EBITDA multiple       0.50    
Finbond [Member]            
Derivatives, Fair Value [Line Items]            
Investment shares owned | shares     267,672,032 267,672,032    
Cell C [Member] | Net1 SA [Member] | Class A [Member]            
Derivatives, Fair Value [Line Items]            
Investment shares owned | shares     75,000,000 75,000,000    
DNI [Member]            
Derivatives, Fair Value [Line Items]            
DNI contingent consideration     R 400.0 $ 28,300,000    
Other payables     R 379.6 $ 26,800,000    
Long-term liabilities         R 373.6 $ 27,200,000
Interest rate     6.30% 6.30%    
[1] Certain amounts shown here do not correspond to the Company's 2018 financial statements and reflects an adjustment made, refer to Note 1 See Notes to Unaudited Condensed Consolidated Financial Statements