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Leases and other commitments - Other commitments (Details) - Water Supply Agreement - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Other commitments    
Commitment R 2,302 R 2,816
Agreement term (in years) 20 years  
Within one year    
Other commitments    
Commitment R 173 171
One to five years    
Other commitments    
Commitment 713 847
More than five years    
Other commitments    
Commitment R 1,416 R 1,798