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Options Granted Under GF Management Incentive Scheme (Detail) (GF Management Incentive Scheme)	6 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Jun. 30, 2010	Jun. 30, 2009	Dec. 31, 2011 South Africa Rand ZAR	Dec. 31, 2010 South Africa Rand ZAR	Jun. 30, 2010 South Africa Rand ZAR	Jun. 30, 2009 South Africa Rand ZAR	Jun. 30, 2008 South Africa Rand ZAR	Dec. 31, 2011 U.S. Dollar USD ($)	Dec. 31, 2010 U.S. Dollar USD ($)	Jun. 30, 2010 U.S. Dollar USD ($)	Jun. 30, 2009 U.S. Dollar USD ($)	Jun. 30, 2008 U.S. Dollar USD ($)
Number of Options
Beginning Balance	1,352,633	976,533	2,304,421	4,212,219
Exercised and released	(348,430)	(614,340)	(778,172)	(1,367,882)
Forfeited	(27,670)	(50,968)	(173,616)	(539,916)
Ending Balance	976,533	311,225	1,352,633	2,304,421
Average option price
Exercised and released					72.33	75.40	74.62	69.69		$ 10.02	$ 10.56	$ 9.84	$ 7.73
Forfeited					118.63	96.06	97.01	105.39		$ 16.43	$ 13.45	$ 12.80	$ 11.70
Average price, at end of year					73.48	75.85	76.15	77.20	78.38	$ 9.04	$ 11.24	$ 10.06	$ 9.58	$ 9.80

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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