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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cell C | $ 172,948 |
Cash and cash equivalents (included in other long-term assets) | 610 | $ 627
Fixed maturity investment (included in cash and cash equivalents) | 8,304 | 5,160
Other | 18 | 37
Total assets at fair value | 181,880 | 5,824
DNI contingent consideration (Note 3) | 27,222 |
Total liabilities at fair value | 27,222 |
Quoted Price In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents (included in other long-term assets) | 610 | 627
Fixed maturity investment (included in cash and cash equivalents) | 8,304 | 5,160
Total assets at fair value | 8,914 | 5,787
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other | 18 | 37
Total assets at fair value | 18 | $ 37
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cell C | 172,948 |
Total assets at fair value | 172,948 |
DNI contingent consideration (Note 3) | 27,222 |
Total liabilities at fair value | $ 27,222 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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