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CASH AND CASH EQUIVALENTS - Market Risks (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in basis points 1.00%  
Interest rate risk [member] | Cash and Cash Equivalents [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
100bp increase R 10.0 R 2.8
100bp decrease R (10.0) R (2.8)