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Intangible Assets - Schedule of Changes in Goodwill (Details) - ZAR (R)
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year R 545,000,000  
Balance at end of year 533,000,000 R 545,000,000
Goodwill    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 526,000,000  
Balance at end of year 520,000,000 526,000,000
Goodwill | Cost    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 2,675,000,000 2,373,000,000
Acquisitions of goodwill 0 302,000,000
Balance at end of year 2,675,000,000 2,675,000,000
Goodwill | Accumulated amortisation and impairments    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (2,149,000,000) (1,782,000,000)
Impairment 6,000,000 367,000,000
Balance at end of year (2,155,000,000) (2,149,000,000)
Bambanani | Goodwill    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 224,000,000  
Balance at end of year 218,000,000 224,000,000
Bambanani | Goodwill | Accumulated amortisation and impairments    
Reconciliation of changes in intangible assets and goodwill    
Impairment 6,000,000 0
Moab Khotsong | Goodwill    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 302,000,000  
Balance at end of year 302,000,000 302,000,000
Tshepong | Goodwill | Accumulated amortisation and impairments    
Reconciliation of changes in intangible assets and goodwill    
Impairment 0 326,000,000
Joel | Goodwill | Accumulated amortisation and impairments    
Reconciliation of changes in intangible assets and goodwill    
Impairment R 0 R 41,000,000