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Long-term debt and finance leases - Fair Value (Details) - Long-term debt - ZAR (R) R in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018
Long-term debt |  |
Total long-term debt (before unamortised loan costs) | R 141,198 | R 109,984
Minimum |  |
Long-term debt |  |
Interest rate (as a percent) | 2.40% |
Maximum |  |
Long-term debt |  |
Interest rate (as a percent) | 15.30% |

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