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Financial risk management and financial instruments - Variable Rate Sensitivity (Details) - Interest rate risk - Variable - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Financial risk management and financial instruments
Percentage of increase in risk variable used for sensitivity analysis	1.00%	1.00%
Percentage of decrease in risk variable used for sensitivity analysis	1.00%	1.00%
South Africa
Financial risk management and financial instruments
Income Statement impact of increase in risk variable	R (66)	R (82)
Income Statement impact of decrease in risk exposure	66	81
Europe
Financial risk management and financial instruments
Income Statement impact of increase in risk variable	6	R 7
Income Statement impact of decrease in risk exposure	(6)
Minimum reasonably possible repo interest rate		0.00%
United States of America
Financial risk management and financial instruments
Income Statement impact of increase in risk variable	(362)	R (42)
Income Statement impact of decrease in risk exposure	362
Minimum reasonably possible repo interest rate		0.00%
Other
Financial risk management and financial instruments
Income Statement impact of increase in risk variable	18	R 23
Income Statement impact of decrease in risk exposure	R (18)

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The increase (decrease) in profit (loss), before tax, as a result of a decrease in a designated risk exposure that was reasonably possible at the end of the reporting period.

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Minimum reasonably possible repo interest rate

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The reasonably possible percentage of decrease in the relevant risk variable used to determine the financial impact in a sensitivity analysis.

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The reasonably possible percentage of increase in the relevant risk variable used to determine the financial impact in a sensitivity analysis.

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