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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Components Of Equity Securities Without Readily Determinable Fair Value And Held To Maturity Investments) (Details) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Cost basis $ 26,993,000 $ 26,993,000
Unrealized holding gains 49,304,000 0
Unrealized holding losses 0 0
Carrying value 76,297,000 26,993,000
Mobikwik [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Cost basis 26,993,000 26,993,000
Unrealized holding gains 49,304,000 0
Unrealized holding losses 0 0
Carrying value 76,297,000 26,993,000
CPS [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Cost basis 0 0
Unrealized holding gains 0 0
Unrealized holding losses 0 0
Carrying value 0 0
Cedar Cellular [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Cost basis 0 0
Unrealized holding gains 0 0
Unrealized holding losses 0 0
Carrying value $ 0 $ 0