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INCOME TAX - Detailed components of the net deferred tax assets and liabilities (Details) - ZAR (R)
R in Millions
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities R (2,178.2) R (1,180.1)  
Deferred tax assets 434.7 245.5  
Net deferred tax liabilities (1,743.5) (934.6) R (527.9)
Property, plant and equipment owned      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (2,047.6) (1,075.1)  
Environmental rehabilitation obligation and other funds      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (127.1) (103.4)  
Deferred tax assets 145.5 159.0  
Other investments      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (3.5) (1.6)  
Other provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 92.5 73.0  
Equity settled share-based payment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 39.1 21.7  
Lease liability      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 4.3 7.4  
Estimated tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 16.1 6.1  
Estimated unredeemed capital allowances      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets R 176.3 R 0.0