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Fair Value Of Financial Instruments (Movement in Carrying Value Of Assets Measured At Fair Value On Recurring Basis) (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2018 USD ($)
Asset
Acquisition of investment in Cell C	$ 5,824
Change in fair value of Cell C	32,473	[1]
Balance as of June 30, 2018	181,880
Significant Unobservable Inputs (Level 3) [Member]
Asset
Balance as of June 30, 2018	172,948
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Asset
Acquisition of investment in Cell C	151,003
Change in fair value of Cell C	32,473
Foreign currency adjustment	(10,528)
Balance as of June 30, 2018	$ 172,948
[1] Certain amounts have been restated to correct the misstatements discussed in Note 1.

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- Definition

Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of addition (reduction) to the amount at which an instrument classified in shareholders' equity could be incurred (settled) in a current transaction between willing parties.

+ References

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