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Long-term debt - Fair Value (Details) - Long-term debt - ZAR (R) R in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017
Long-term debt |  |
Total long-term debt (before unamortised loan costs) | R 109,984 | R 82,261
Minimum |  |
Long-term debt |  |
Interest rate (as a percent) | 1.20% |
Maximum |  |
Long-term debt |  |
Interest rate (as a percent) | 13.30% |

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