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Income Taxes (Movement In Valuation Allowance) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances, Balance, Beginning Balance $ 117,101 $ 118,777
Charged to statement of operations 5,916 8,119
Reversed to statement of operations (1,701) (301)
Utilized   (1)
Foreign currency adjustment (9,845) (9,493)
Valuation Allowances, Balance, Ending Balance 109,120 117,101
South Africa [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Change in tax rate (2,351)  
Capital Losses Related To Investments [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances, Balance, Beginning Balance 42,587 47,518
Charged to statement of operations 5 195
Reversed to statement of operations 0 0
Utilized   0
Foreign currency adjustment (5,135) (5,126)
Valuation Allowances, Balance, Ending Balance 36,267 42,587
Capital Losses Related To Investments [Member] | South Africa [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Change in tax rate (1,190)  
Net Operating Loss Carry-forwards [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances, Balance, Beginning Balance 39,652 36,270
Charged to statement of operations 5,492 7,647
Reversed to statement of operations (579) (167)
Utilized   (1)
Foreign currency adjustment (5,023) (4,097)
Valuation Allowances, Balance, Ending Balance 38,381 39,652
Net Operating Loss Carry-forwards [Member] | South Africa [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Change in tax rate (1,161)  
Foreign Tax Credits [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances, Balance, Beginning Balance 32,671 32,737
Charged to statement of operations 0 0
Reversed to statement of operations (510) (66)
Utilized   0
Foreign currency adjustment 438 0
Valuation Allowances, Balance, Ending Balance 32,599 32,671
Foreign Tax Credits [Member] | South Africa [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Change in tax rate 0  
Other [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Valuation Allowances, Balance, Beginning Balance 2,191 2,252
Charged to statement of operations 419 277
Reversed to statement of operations (612) (68)
Utilized   0
Foreign currency adjustment (125) (270)
Valuation Allowances, Balance, Ending Balance 1,873 $ 2,191
Other [Member] | South Africa [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Change in tax rate $ 0