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INCOME TAX EXPENSE - Movements in net deferred tax liability (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liability (asset) R 135.5 R 187.9  
Recognised in profit or loss (19.5) 52.4 R (41.3)
Deferred tax liability (asset) 155.0 135.5 R 187.9
Deferred tax assets have not been recognised [abstract]      
Current year tax losses for which no deferred tax has been recognised (0.8) (0.3)  
Unredeemed capital expenditure 272.9 272.9  
Capital losses 330.0 325.2  
Property, plant and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Recognised in profit or loss (37.7) 83.1  
Other temporary differences [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Recognised in profit or loss R (0.3) R (1.3)