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INCOME TAX EXPENSE - Detailed components of the net deferred tax assets and liabilities (Details) - ZAR (R)
R in Millions
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax liabilities R (475.0) R (412.8)  
Gross deferred tax assets 209.9 229.6  
Net deferred tax liabilities (265.1) (183.2) R (155.0)
Property, plant and equipment (excluding capital expenditure) [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax liabilities (422.4) (380.2)  
Environmental rehabilitation obligation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax liabilities (51.4) (32.0)  
Gross deferred tax assets 126.5 112.6  
Other provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 72.6 33.8  
Other temporary differences [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 8.5 0.0  
Estimated tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 1.2 0.0  
Estimated unredeemed capital expenditure [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 1.1 83.2  
Investments [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax liabilities R (1.2) R 0.0