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INCOME TAX EXPENSE - Movements in net deferred tax liability (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract      
Balance at the beginning of the year R (183.2) R (155.0)  
Recognised in profit or loss (80.7) (28.2) R 19.5
Recognised in other comprehensive income (1.2) 0.0  
Balance at the end of the year R (265.1) R (183.2) R (155.0)