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Cash Generated by Operations - Narrative (Details) - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of financial assets [line items] |  |  |
Borrowing facilities available for future operation activities and future capital commitments | R 1,277 | R 845 | R 2,142
Restricted investments (environmental trusts) |  |  |
Disclosure of financial assets [line items] |  |  |
Interest income | R 168 | R 157 | R 153

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