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Income Taxes (Reconciliation Of Income Taxes) (Details)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
[1]
Jun. 30, 2017
[1]
Income tax rate reconciliation:      
Income taxes at fully-distributed South African tax rates 28.00% 28.00% 28.00%
Movement in valuation allowance (24.23%) 5.99% 0.07%
Non-deductible items (4.75%) 15.19% 1.05%
Capital gains differential (1.54%) (1.81%)  
Taxation on deemed dividends in the United States 1.53% 1.92% 8.00%
Foreign tax rate differential 0.38% (0.65%)  
Prior year adjustments (0.63%) (0.02%) 0.07%
Transition Tax (0.36%) 55.38%  
Foreign tax credits 0.37% (55.58%) (0.05%)
Income tax provision (1.23%) 48.42% 37.14%
[1] Non-deductible items for 2018 and 2017 have been restated to correct the misstatement discussed in Note 1.