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Related party transactions - material transactions (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of transactions between related parties [line items]      
Impairment of outstanding balances R 0    
Purchases by subsidiaries from related parties 759 R 737 R 680
Joint ventures      
Disclosure of transactions between related parties [line items]      
Sales and services rendered from subsidiaries to related parties 965 1,088 1,079
Purchases by subsidiaries from related parties 671 617 592
Associates      
Disclosure of transactions between related parties [line items]      
Purchases by subsidiaries from related parties R 88 R 120 R 88