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OTHER INVESTMENTS - Fair value of investments (Details) - At Fair Value [Member] - Rand Refinery Proprietary Limited ("Rand Refinery") [member] - ZAR (R) R in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of fair value measurement of assets [line items]
Beginning balance	R 178.4	R 0.0
Fair value adjustment on equity investments at fair value through other comprehensive income	(59.1)	178.4
Ending balance	R 119.3	R 178.4

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- Definition

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The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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- Definition

The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph e
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