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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

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