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Fair Value Of Financial Instruments ( Schedule Of Key Valuation Inputs Used) (Details) - 12 months ended Jun. 30, 2019
$ in Millions, R in Billions
ZAR (R)
USD ($)
Deferred tax including assessed tax losses R 2.9 [1] $ 20.6
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member]    
Investment fair value measurement inputs 15.00%  
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member]    
Investment fair value measurement inputs 20.00%  
Cell C [Member]    
Net adjusted external debt R 13.9 [1] $ 648.9
Lease liabilities included in net adjusted external debt R 6.4  
Cell C [Member] | Long Term Growth Rate [Member]    
Investment fair value measurement inputs 4.50%  
Cell C [Member] | Marketability Discount [Member]    
Investment fair value measurement inputs 10.00%  
Cell C [Member] | Minority Discount [Member]    
Investment fair value measurement inputs 15.00%  
[1] translated from ZAR to U.S. dollars at exchange rates applicable as of June 30, 2019.