Income Taxes (Provisions For Income Taxes By Location Of Taxing Jurisdiction) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Current income tax	$ 49,092	$ 117,141	$ 109,669
Deferred taxation (benefit) charge	(4,598)	(4,862)	(2,770)
Capital gains tax	1,465
Secondary taxation on companies	327
Changes in tax rate	(18,315)
Foreign tax credits generated-United States	(12,035)	(78,754)	(66,077)
INCOME TAX EXPENSE - (Note 11)	15,936	33,525	40,822
South Africa [Member]
Current income tax	26,787	38,882	47,225
Deferred taxation (benefit) charge	(2,941)	(776)	(441)
United States [Member]
Current income tax	20,746	77,085	62,443
Deferred taxation (benefit) charge	31	2,306	(1,236)
Other [Member]
Current income tax	1,559	1,174	1
Deferred taxation (benefit) charge	$ (1,688)	$ (6,392)	$ (1,093)