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Financial risk management and financial instruments - Variable Rate Sensitivity (Details) - Interest rate risk - Variable - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Financial risk management and financial instruments |  |
Percentage of increase in risk variable used for sensitivity analysis | 1.00% | 1.00%
Percentage of decrease in risk variable used for sensitivity analysis | 1.00% | 1.00%
South Africa |  |
Financial risk management and financial instruments |  |
Income Statement impact of increase in risk variable | R (66) | R (82)
Income Statement impact of decrease in risk exposure | 66 | 81
Europe |  |
Financial risk management and financial instruments |  |
Income Statement impact of increase in risk variable | 6 | R 7
Income Statement impact of decrease in risk exposure | (6) |
Minimum reasonably possible repo interest rate |  | 0.00%
United States of America |  |
Financial risk management and financial instruments |  |
Income Statement impact of increase in risk variable | (362) | R (42)
Income Statement impact of decrease in risk exposure | 362 |
Minimum reasonably possible repo interest rate |  | 0.00%
Other |  |
Financial risk management and financial instruments |  |
Income Statement impact of increase in risk variable | 18 | R 23
Income Statement impact of decrease in risk exposure | R (18) |

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