Borrowings (Summary Of Long-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2018
Debt Instrument [Line Items]
Utilized	$ 14,798	$ 14,613	[1]	$ 113,157	[1]
Repaid	(14,503)	(37,357)	[1]	(77,062)	[1]
South Africa [Member]
Debt Instrument [Line Items]
Current portion of long-term borrowings				49,548
Long-term borrowings				44,079
Beginning Balance	0	5,469
Utilized	14,798
Repaid	(14,503)	(31,844)
Repaid from sale of DNI shares (Note 10)		(15,011)
Foreign currency adjustment	(295)	(2,693)
Ending Balance	0	0		5,469
Amended July 2017 [Member] | South Africa [Member]
Debt Instrument [Line Items]
Current portion of long-term borrowings				44,079
Long-term borrowings				5,469
Beginning Balance	0	49,548
Utilized	14,798
Repaid	(14,503)	(31,844)
Repaid from sale of DNI shares (Note 10)		(15,011)
Foreign currency adjustment	(295)	(2,693)
Ending Balance	$ 0	$ 0		$ 49,548

[1] Certain amounts have been restated to correct the misstatement discussed in Note 1