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Financial risk management and financial instruments - Commodity Price Sensitivity (Details) - Commodity price risk - crude oil - ZAR (R) R in Millions	12 Months Ended
	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%
Income Statement impact of increase in risk variable	R (153)	R (95)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

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

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No definition available.

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- Definition

The reasonably possible percentage of change in the designated risk exposure used to determine the financial impact in a sensitivity analysis. A decrease would result in a positive change to equity and income. An increase would result in a negative change to equity and income in the same amounts.

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No definition available.

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