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Income Taxes (Provisions For Income Taxes By Location Of Taxing Jurisdiction) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Income Tax [Line Items]      
Current income tax $ 48,795 $ 61,902 $ 33,968
Deferred taxation (benefit) charge (2,292) (7,887) (4,915)
Capital gains tax   202 7
Foreign tax credits generated-United States (2,367) (14,838) (14,404)
Income tax provision 44,136 39,379 14,656
South Africa [Member]      
Income Tax [Line Items]      
Current income tax 39,901 41,326 15,418
Deferred taxation (benefit) charge 398 (3,345) (2,037)
United States [Member]      
Income Tax [Line Items]      
Current income tax 3,109 14,838 16,061
Deferred taxation (benefit) charge 485 (107) (331)
Other [Member]      
Income Tax [Line Items]      
Current income tax 5,785 5,738 2,489
Deferred taxation (benefit) charge $ (3,175) $ (4,435) $ (2,547)