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Net finance costs - Finance costs (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest R 10,048 R 10,712 R 9,005
Amortisation of loan costs 126 161 212
Notional interest 1,171 1,198 1,116
Total finance costs 11,345 12,071 10,333
Amounts capitalised to assets under construction, a class of Property, plant and equipment (1,883) (1,644) (1,074)
Finance costs per income statement 9,462 10,427 9,259
Total finance costs before amortisation of loan costs and notional interest 10,048 10,712 9,005
Add: amortisation of modification (loss)/gain (1)   194
Less: unwinding of loan costs     (144)
Less: interest accrued on long-term debt, lease liabilities and short-term debt (2,035) (2,071) (1,966)
Less: interest raised on tax payable (14) (3) (6)
Finance costs per the statement of cash flows [1] 7,998 8,638 7,083
Debt      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 8,178 8,952 7,408
Total finance costs before amortisation of loan costs and notional interest 8,178 8,952 7,408
Lease liabilities      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 1,669 1,557 1,451
Total finance costs before amortisation of loan costs and notional interest 1,669 1,557 1,451
Other      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 201 203 146
Total finance costs before amortisation of loan costs and notional interest R 201 R 203 R 146
[1] Included in finance costs paid are amounts capitalised to assets under construction a class of Property, plant and equipment (refer to note 16).