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Financial risk management and financial instruments - Currency Exposure (Details) - Foreign currency risk - 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 change in significant exposure used for sensitivity analysis | 10.00% | 10.00%
Euro |  |
Financial risk management and financial instruments |  |
Net exposure | R 171 | R (2,960)
Equity impact of decrease in risk exposure | 17 | (296)
Income Statement impact of decrease in risk exposure | 17 | (296)
US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure | 10,614 | 11,390
Equity impact of decrease in risk exposure | 1,053 | 1,139
Income Statement impact of decrease in risk exposure | 1,053 | 1,139
External balances | Euro |  |
Financial risk management and financial instruments |  |
Net exposure on assets | 2,843 | 2,722
Net exposure on liabilities | (281) | (2,811)
Net exposure | 2,562 | (89)
External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on assets | 3,952 | 4,181
Net exposure on liabilities | (2,922) | (1,053)
Net exposure | 1,030 | 3,128
Balances between group companies | Euro |  |
Financial risk management and financial instruments |  |
Net exposure | (2,391) | (2,871)
Balances between group companies | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure | 9,584 | 8,262
Long-term debt | External balances | Euro |  |
Financial risk management and financial instruments |  |
Net exposure on liabilities | (153) | (103)
Long-term debt | External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on liabilities | (1,651) | (31)
Short-term debt | External balances | Euro |  |
Financial risk management and financial instruments |  |
Net exposure on liabilities |  | (2,542)
Short-term debt | External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on liabilities | (23) | (22)
Trade and other payables | External balances | Euro |  |
Financial risk management and financial instruments |  |
Net exposure on liabilities | (128) | (166)
Trade and other payables | External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on liabilities | (1,248) | (986)
Bank overdraft | External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on liabilities |  | (14)
Trade and other receivables | External balances | Euro |  |
Financial risk management and financial instruments |  |
Net exposure on assets | 586 | 312
Trade and other receivables | External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on assets | 2,500 | 1,911
Cash restricted for use | External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on assets | 245 | 515
Cash | External balances | Euro |  |
Financial risk management and financial instruments |  |
Net exposure on assets | 2,257 | 2,410
Cash | External balances | US Dollar |  |
Financial risk management and financial instruments |  |
Net exposure on assets | R 1,207 | R 1,755

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