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Net finance costs - Finance costs (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of detailed information about borrowings [line items]      
Borrowing costs incurred before amortisation of loan costs and notional interest R 5,903 R 4,916 R 3,779
Amortisation of loan costs 462 279 157
Notional interest 962 834 657
Total finance costs 7,327 6,029 4,593
Amounts capitalised to assets under construction (3,568) (2,764) (2,253)
Finance costs per income statement 3,759 3,265 2,340
Total finance costs before amortisation of loan costs and notional interest 5,903 4,916 3,779
Less: interest accrued on long-term debt (878) (956) (530)
Less: interest accrued on tax payable (228) (348)  
Finance costs per the statement of cash flows 4,797 3,612 3,249
Debt and interest rate swap      
Disclosure of detailed information about borrowings [line items]      
Borrowing costs incurred before amortisation of loan costs and notional interest 4,166 3,463 2,696
Total finance costs before amortisation of loan costs and notional interest 4,166 3,463 2,696
Secured and unsecured debt      
Disclosure of detailed information about borrowings [line items]      
Borrowing costs incurred before amortisation of loan costs and notional interest 3,880 3,162 2,599
Total finance costs before amortisation of loan costs and notional interest 3,880 3,162 2,599
Interest rate swap      
Disclosure of detailed information about borrowings [line items]      
Borrowing costs incurred before amortisation of loan costs and notional interest 286 301 97
Total finance costs before amortisation of loan costs and notional interest 286 301 97
Preference shares      
Disclosure of detailed information about borrowings [line items]      
Borrowing costs incurred before amortisation of loan costs and notional interest 963 989 981
Total finance costs before amortisation of loan costs and notional interest 963 989 981
Finance leases      
Disclosure of detailed information about borrowings [line items]      
Borrowing costs incurred before amortisation of loan costs and notional interest 483 86 76
Total finance costs before amortisation of loan costs and notional interest 483 86 76
Other      
Disclosure of detailed information about borrowings [line items]      
Borrowing costs incurred before amortisation of loan costs and notional interest 291 378 26
Total finance costs before amortisation of loan costs and notional interest R 291 R 378 R 26