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Financial risk management and financial instruments - Foreign Currency Risk (Details) € in Millions, R in Millions, $ in Millions | 12 Months Ended |  |
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Jun. 30, 2019 USD ($) | Jun. 30, 2019 ZAR (R) | Jun. 30, 2018 EUR (€) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 ZAR (R)
Zero-cost collar |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |
Period of foreign currency exposure hedged | 12 months |  |  |  |
Notional amount | $ 4,000 |  |  | $ 4,000 |
Zero-cost collar | Maximum |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |
Maturity period of derivatives | 1 year |  |  |  |
Foreign exchange contracts |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |
Notional amount | $ 146 |  |  | 226 |
Foreign exchange contracts | Cash flow hedge | Rand |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |
Notional amount | R |  | R 0 |  |  | R 33
Foreign exchange contracts | Cash flow hedge | US Dollar |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |
Notional amount |  |  |  | $ 0 |
Foreign exchange contracts | Cash flow hedge | Euro |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |
Notional amount | € |  |  | € 2.1 |  |

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