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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Unrealized Gain (Loss) On Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jun. 30, 2017
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Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | $ 178,127 |
Unrealized holding gains | 38,612 |
Unrealized holding losses |  |
Carrying value | 216,739 | $ 0
Cell C [Member] |  |
Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | 169,127 |
Unrealized holding gains | 37,843 |
Unrealized holding losses |  |
Carrying value | 206,970 |
Cedar Cellular [Member] |  |
Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | 9,000 |
Unrealized holding gains | 769 |
Unrealized holding losses |  |
Carrying value | $ 9,769 |

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