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Financial Risk Management - Other Price Risk (Details) - Other price risk - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Reasonably possible increase in risk variable percent | 10.00% | 10.00%
Reasonably possible decrease in risk variable percent | 10.00% | 10.00%
Increase by 10%, impact on earnings | R 76 | R 42
Decrease by 10%, impact on earnings | R 17 | R 32

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