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Income Taxes (Provisions For Income Taxes By Location Of Taxing Jurisdiction) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Income Tax [Line Items]      
Current income tax $ 17,163 $ 95,529 $ 45,857
Deferred taxation (benefit) charge (12,494) 8,537 (6)
Foreign tax credits generated-United States (944) (55,778) (3,345)
Change in tax rate - United States   309  
Income tax provision 3,725 48,597 [1] 42,506 [1]
South Africa [Member]      
Income Tax [Line Items]      
Current income tax 10,076 35,745 35,986
Deferred taxation (benefit) charge (11,117) 9,772 (439)
United States [Member]      
Income Tax [Line Items]      
Current income tax 1,100 55,788 4,686
Deferred taxation (benefit) charge 4 477 1,123
Other [Member]      
Income Tax [Line Items]      
Current income tax 5,987 3,996 5,185
Deferred taxation (benefit) charge $ (1,381) $ (1,712) $ (690)
[1] Certain amounts have been restated to correct the misstatement discussed in Note 1.