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Non-Current Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 | Jun. 30, 2010
Rusoro Mining Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership % | 26.40% | 26.40% | 26.40%
Rand Refinery Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership % | 34.90% | 34.90% | 34.90%
Dividends received from Rand Refinery | $ 5.4 |  |
Amount owing from Rand Refinery | $ 41.9 | $ 63.9 | $ 64.1

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