Income Taxes (Reconciliation Of Income Taxes) (Details)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income tax rate reconciliation:
Income taxes at fully-distributed South African tax rates	28.00%	28.00%	28.00%
Non-deductible items	22.35%	1.01%	0.38%
Foreign tax rate differential	(0.96%)	0.00%	7.42%
Transition Tax	81.88%
Foreign tax credits	(82.17%)	(0.05%)	(36.88%)
Indirect foreign tax credits repealed	48.07%
Taxation on deemed dividends in the United States	2.84%	8.00%	34.60%
Movement in valuation allowance	(39.22%)	0.07%	(0.09%)
Change in tax laws - United States	0.16%
Prior year adjustments	(0.03%)	0.07%	(0.09%)
Income tax provision	60.92%	37.10%	33.34%