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Borrowings - Disclosure of Effective Interest Rates (Details) - Effective Interest Rate
Jun. 30, 2019
Jun. 30, 2018
R1 billion revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Interest rate 10.10% 10.20%
R2 billion facility    
Disclosure of detailed information about borrowings [line items]    
Interest rate 10.00% 0.00%
Westpac fleet loan    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.50% 0.00%
US$250 million revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Interest rate 0.00% 4.20%
US$350 million facility    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.60% 4.80%
US$200 million bridge loan    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.10% 4.50%