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Net finance costs - Finance costs (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest R 9,005 R 6,871 R 6,810
Amortisation of loan costs 212 132 160
Notional interest 1,116 633 668
Total finance costs 10,333 7,636 7,638
Amounts capitalised to assets under construction, a class of Property, plant and equipment (1,074) (740) (880)
Finance costs per income statement 9,259 6,896 6,758
Total finance costs before amortisation of loan costs and notional interest 9,005 6,871 6,810
Add: modification gain   74  
Add: amortisation of modification gain 194    
Less: unwinding of loan costs (144)    
Less: interest accrued on long-term debt, lease liabilities and short-term debt (1,966) (1,463) (637)
Less: interest raised on tax payable (6) (4)  
Finance costs per the statement of cash flows 7,083 5,478 6,173
Debt and interest rate swap      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 7,408 5,419 5,238
Total finance costs before amortisation of loan costs and notional interest 7,408 5,419 5,238
Secured and unsecured debt      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 7,408 5,066 4,855
Total finance costs before amortisation of loan costs and notional interest 7,408 5,066 4,855
Interest rate swap      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest   353 383
Total finance costs before amortisation of loan costs and notional interest   353 383
Lease liabilities      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 1,451 1,357 1,488
Total finance costs before amortisation of loan costs and notional interest 1,451 1,357 1,488
Other      
Disclosure of detailed information about borrowings      
Borrowing costs incurred before amortisation of loan costs and notional interest 146 95 84
Total finance costs before amortisation of loan costs and notional interest R 146 R 95 R 84