Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cell C	$ 121,941	$ 172,948
Cash and cash equivalents (included in other long-term assets)	596	610
Fixed maturity investments (included in cash and cash equivalents)	4,620	8,304
Other	420	18
Total assets at fair value	127,577	181,880
DNI contingent consideration		27,222
Foreign exchange contracts	31
Total liabilities at fair value	31	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)	596	610
Fixed maturity investments (included in cash and cash equivalents)	4,620	8,304
Total assets at fair value	5,216	8,914
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other	420	18
Total assets at fair value	420	18
Foreign exchange contracts	31
Total liabilities at fair value	31
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cell C	121,941	172,948
Total assets at fair value	$ 121,941	172,948	$ 206,970	$ 151,003
DNI contingent consideration		27,222
Total liabilities at fair value		$ 27,222