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Fair Value Of Financial Instruments (Narrative) (Details)
R in Millions
3 Months Ended
Sep. 30, 2019
USD ($)
contract
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
contract
Sep. 30, 2018
ZAR (R)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
ZAR (R)
Jun. 30, 2018
USD ($)
Derivatives, Fair Value [Line Items]              
Other payables $ 7,578,000   $ 10,814,000        
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]              
Investment amount owned $ 0   $ 0        
Adjusted EBITDA           R 3,900.0 $ 275,800,000
EBITDA multiple           6.75% 6.75%
Net external debt           R 8,800.0 $ 622,300,000
Marketability discount           10.00% 10.00%
Equity method investment, percentage of ownership interest 0.00%            
DNI [Member]              
Derivatives, Fair Value [Line Items]              
Other payables       R 379.6 $ 26,800,000    
Long-term liabilities           R 373.6 $ 27,200,000
DNI [Member] | Maximum [Member]              
Derivatives, Fair Value [Line Items]              
DNI contingent consideration       R 400.0 $ 28,300,000    
Cell C [Member] | Net1 SA [Member] | Class A [Member]              
Derivatives, Fair Value [Line Items]              
Investment shares owned | shares 75,000,000