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Borrowings (Summary Of Long-Term Borrowings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]      
Utilized $ 0 $ 14,798 $ 14,613
Repaid 0 (14,503) (37,357)
South Africa [Member]      
Debt Instrument [Line Items]      
Current portion of long-term borrowings     0
Beginning Balance 0    
Repaid   (14,798)  
Repaid from sale of DNI shares (Note 10)   (14,503)  
Foreign currency adjustment   (295)  
Ending Balance   0  
Amended July 2017 [Member] | South Africa [Member]      
Debt Instrument [Line Items]      
Beginning Balance $ 0 0  
Repaid   (14,798)  
Repaid from sale of DNI shares (Note 10)   (14,503)  
Foreign currency adjustment   (295)  
Ending Balance   $ 0 $ 0