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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Other Long-Term Asset) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Jun. 30, 2022
Jun. 30, 2021
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Total equity investments $ 76,297 $ 76,297  
Policy holder assets under investment contracts (Note 12) 270 371  
Reinsurance assets under insurance contracts (Note 12) 1,502 1,424  
Total other long-term assets 78,069 78,092 [1]  
Accounts receivable, allowances 295 509 $ 267
Carbon Tech Limited [Member]      
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Accounts receivable, allowances   1,000  
Loan [Member] | Carbon Tech Limited [Member]      
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Notes payable amount 750    
Debt, face value 3,000    
Mobikwik [Member]      
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Total equity investments $ 76,297 $ 76,297  
Equity-accounted investments, ownership percentage 10.00% 10.00%  
Cell C [Member]      
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Total equity investments $ 0 $ 0  
Equity-accounted investments, ownership percentage 5.00% 15.00%  
CPS [Member]      
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Total equity investments $ 0 $ 0  
Equity-accounted investments, ownership percentage 87.50% 87.50%  
Cedar Cellular [Member]      
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Equity-accounted investments, ownership percentage 7.625%    
Cedar Cellular [Member] | 8.625% Notes [Member]      
Schedule Of Equity And Held To Maturity Investments [Line Items]      
Interest rate 8.625%    
[1] (A) – Derived from audited financial statements