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Provision for Environmental Rehabilitation - Disclosure of Rates Used in the Calculated of the Provision (Details) - Provision for environmental rehabilitation | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
South African operations |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Inflation rate | 5.25% | 5.50% | 6.50%
South African operations | - 12 months |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Discount rates | 6.50% | 6.70% | 7.50%
South African operations | - one to five years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Discount rates | 6.85% | 7.00% | 7.60%
South African operations | - six to nine years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Discount rates | 8.50% | 8.20% | 8.40%
South African operations | - ten years or more |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Discount rates | 9.60% | 8.60% | 9.10%
PNG operations |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Inflation rate | 5.00% | 6.00% | 6.60%
Discount rates | 6.25% | 6.25% | 6.25%

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