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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax liabilities R (562.0) R (475.0)  
Gross deferred tax assets 190.7 209.9  
Net deferred tax liabilities (371.3) (265.1) R (183.2)
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 (494.4) (422.4)  
Environmental rehabilitation obligation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax liabilities (60.2) (51.4)  
Gross deferred tax assets 124.5 126.5  
Other provisions [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 46.7 72.6  
Other temporary differences [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 14.3 8.5  
Estimated income tax losses [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 4.1 0.0  
Estimated capital losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 0.0 1.2  
Estimated unredeemed capital expenditure [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax assets 1.1 1.1  
Investments [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Gross deferred tax liabilities R (7.4) R (1.2)