Provision for Silicosis Settlement - Narrative (Details) - Provision raised for settlement - ZAR (R) R in Millions	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disclosure of other provisions [line items]
Discount rates	8.50%	8.50%	8.00%
Change in estimate	R 62	R 68
Nominal amount	R 1,300

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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