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Share-Based Payments - Narrative (Details)
R / shares in Units, R in Millions
12 Months Ended 103 Months Ended
Jan. 15, 2019
shares
Jun. 25, 2013
ZAR (R)
Mar. 20, 2013
Jun. 30, 2019
shares
R / shares
Jun. 30, 2019
shares
Jun. 30, 2018
shares
Jun. 30, 2017
shares
Phoenix              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Disposal of operations, percent     30.00%        
Disposal group ownership interest disposed, free-carry allocation percentage     5.00%        
Fair value expensed | R   R 23          
Sisonke ESOP              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Spot share price (in SA rand per share) | R / shares       R 28.29      
2006 share plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of share option awards outstanding (in shares)       27,720,640 27,720,640    
Ordinary shares              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of shares authorised       60,011,669 60,011,669    
Number of shares issued         37,546,904    
Share appreciation rights | 2006 share plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of share option awards outstanding (in shares)       6,713,044 6,713,044 9,847,860 12,476,697
Participation units | Sisonke ESOP              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Number of share option awards outstanding (in shares)       6,819,025 6,819,025 0 0
Vesting period (in years) 3 years            
Number of participation units awarded to each beneficiary under scheme 225