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Long-term debt - Reconciliation (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Long-term debt.      
Balance at beginning of year R 81,405 R 79,877  
Loans raised 31,061 9,664  
Proceeds from new loans 24,961 9,277  
Finance leases acquired 6,100 387  
Loans repaid (9,199) (2,364)  
Interest accrued 878 956 R 530
Amortisation of loan costs 462 279  
Translation effect of foreign currency loans 22 (15)  
Translation of foreign operations 4,825 (6,992)  
Balance at end of year R 109,454 R 81,405 R 79,877