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Income Taxes (Provision For Income Taxes By Location Of Taxing Jurisdiction) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Income Tax [Line Items]      
Current income tax expense (benefit) $ 6,317 $ 2,309 $ 859
Deferred taxation (benefit) charge (7,442) (2,044) 6,691
Foreign tax credits generated-United States 115 62 10
Income tax (benefit) provision (2,309) 327 7,560
South Africa [Member]      
Income Tax [Line Items]      
Current income tax expense (benefit) 6,317 2,309 866
Deferred taxation (benefit) charge (7,490) (2,154) (2,039)
Income tax (benefit) provision 1,300    
United States [Member]      
Income Tax [Line Items]      
Current income tax expense (benefit) 0 0 (75)
Deferred taxation (benefit) charge 0 0 9,136
Other Income Tax Segment [Member]      
Income Tax [Line Items]      
Current income tax expense (benefit) 0 0 68
Deferred taxation (benefit) charge $ 48 $ 110 $ (406)