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Fair Value Of Financial Instruments (Narrative) (Details)
R in Millions
12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2018
ZAR (R)
contract
Jun. 30, 2018
USD ($)
contract
Aug. 02, 2017
shares
Jun. 30, 2016
USD ($)
Derivatives, Fair Value [Line Items]            
Years of significant fluctuation of US Dollar to ZAR exchange rate 3 years          
Adjusted EBITDA   $ 5,824,000   $ 181,880,000    
Acquisition-related expenditures           $ 200,000
Transfers into or out of Level 3 $ 0 $ 0        
Impairment charges $ 0          
Outstanding foreign exchange contracts | contract   0 0 0    
Cell C [Member]            
Derivatives, Fair Value [Line Items]            
Equity method investment, percentage of ownership interest     14.00% 14.00%    
Adjusted EBITDA     R 3,900.0 $ 284,800,000    
EBITDA multiple 6.75          
Net external debt     R 8.8 $ 641,100,000    
Impact of increase and decrease to EBITDA multiple     0.50% 0.50%    
Marketability discount 10.00%          
Cell C [Member]            
Derivatives, Fair Value [Line Items]            
Equity-accounted investments, ownership percentage     15.00% 15.00%    
Cell C [Member] | Net1 SA [Member] | Class A [Member]            
Derivatives, Fair Value [Line Items]            
Investment shares owned | shares         75,000,000