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Long-term debt and finance leases - Fair Value (Details) - Long-term debt - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Long-term debt    
Total long-term debt (before unamortised loan costs) R 141,198 R 109,984
Minimum    
Long-term debt    
Interest rate (as a percent) 2.40%  
Maximum    
Long-term debt    
Interest rate (as a percent) 15.30%