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REVENUE - Market risk (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Commodity price risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk 20.00%    
Commodity price risk | Top of range      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) from change in fair value of derivatives recognised in profit and loss R 1,099.3 R 1,023.7 R 1,053.8
Commodity price risk | Bottom of range      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) from change in fair value of derivatives recognised in profit and loss R (1,099.3) (1,023.7) (1,053.8)
Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk 20.00%    
Currency risk | Top of range      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) from change in fair value of derivatives recognised in profit and loss R 1,099.3 1,023.7 1,053.8
Currency risk | Bottom of range      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) from change in fair value of derivatives recognised in profit and loss R (1,099.3) R (1,023.7) R (1,053.8)