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Intangible Assets - Schedule of Intangible Assets (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about intangible assets [line items]    
Goodwill R 520 R 526
Technology-based assets 13 19
Total intangible assets R 533 545
Computer software    
Disclosure of detailed information about intangible assets [line items]    
Amortisation rate (as a percent) 20.00%  
Moab Khotsong    
Disclosure of detailed information about intangible assets [line items]    
Goodwill R 0 302
Moab Khotsong | Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Measurement period adjustment recognised for Goodwill   R 30