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TRADE AND OTHER RECEIVABLES - Movement in the allowance for impairment in respect of trade and other receivables (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Opening balance R (4.9) R (9.2)
Credit loss allowance/impairments recognised included in operating costs (0.2) (3.1)
Credit loss allowance/impairments reversed included in operating costs 0.4 5.3
Credit loss allowance written off against related receivable 2.1 5.3
Closing balance R (2.6) (4.9)
Financial Effect Of Changes In Accounting Policy [member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Opening balance   (3.2)
In accordance with IFRS 9 [member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Opening balance   R (12.4)