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INCOME TAX - Detailed components of the net deferred tax assets and liabilities (Details) - ZAR (R)
R in Millions
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities R (736.6) R (601.8)  
Deferred tax assets 208.7 164.4  
Net deferred tax liabilities (527.9) (437.4) R (371.3)
Property, plant and equipment (excluding unredeemed capital allowances)      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (659.7) (537.6)  
Environmental rehabilitation obligation and other funds      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (76.3) (63.3)  
Deferred tax assets 113.9 105.6  
Other investments      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (0.6) (0.9)  
Other provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 81.0 49.3  
Other temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 9.0 4.6  
Estimated tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4.8 4.1  
Estimated unredeemed capital allowances      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets R 0.0 R 0.8