Income Taxes (Provisions For Income Taxes By Location Of Taxing Jurisdiction) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Tax [Line Items]
Current income tax	$ 88,807	$ 48,795	$ 61,902
Deferred taxation (benefit) charge	(161)	(2,292)	(7,887)
Capital gains tax			202
Foreign tax credits generated-United States	(46,566)	(2,367)	(14,838)
Income tax provision	42,080	44,136	39,379
South Africa [Member]
Income Tax [Line Items]
Current income tax	31,815	39,901	41,326
Deferred taxation (benefit) charge	3,044	398	(3,345)
United States [Member]
Income Tax [Line Items]
Current income tax	50,750	3,109	14,838
Deferred taxation (benefit) charge	(274)	485	(107)
Other [Member]
Income Tax [Line Items]
Current income tax	6,242	5,785	5,738
Deferred taxation (benefit) charge	$ (2,931)	$ (3,175)	$ (4,435)