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TRADE AND OTHER RECEIVABLES - Balances of counterparties who have been assessed as being credit impaired at reporting date (Details) - ZAR (R)
R in Millions
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables R 23.1 R 0.0  
Other receivables 17.3 25.3  
Loss allowance (2.6) (4.9) R (9.2)
Trade and other receivables 146.4 67.9  
Financial instruments not credit-impaired [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 23.1 0.0  
Other receivables 14.7 23.2  
Loss allowance 0.0 (2.8)  
Trade and other receivables 37.8 23.2  
Financial instruments credit-impaired [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 0.0 0.0  
Other receivables 2.6 2.1  
Loss allowance (2.6) (2.1)  
Trade and other receivables R 2.6 R 2.1