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Income Taxes (Reconciliation Of Income Taxes) (Details)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income tax rate reconciliation:      
Income taxes at fully-distributed South African tax rates 28.00% 28.00% 28.00%
Non-deductible items 15.11% 1.01% 0.38%
Capital gains differential (1.81%)    
Foreign tax rate differential (0.65%) 0.00% 7.42%
Transition Tax 55.38%    
Foreign tax credits (55.58%) (0.05%) (36.88%)
Taxation on deemed dividends in the United States 1.92% 8.00% 34.60%
Movement in valuation allowance 5.99% 0.07% (0.09%)
Change in tax laws - United States 0.11%    
Prior year adjustments (0.02%) 0.07% (0.09%)
Income tax provision 48.45% 37.10% 33.34%