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Share-Based Payments - Terms and Conditions of Options Granted Under the 2006 Share Plan and the Sisonke ESOP (Details)
12 Months Ended 36 Months Ended
Jan. 15, 2019
Jun. 30, 2019
Jun. 30, 2018
2006 share plan | Share appreciation rights      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Remaining life (in years)   6 years  
2006 share plan | Performance shares      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period (in years)   3 years  
Number of rights linked to group on a absolute basis (as a percent)     50.00%
Number of rights linked to group on a market basis (as a percent)     50.00%
2006 share plan | Restricted shares      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period (in years)   3 years  
Sisonke ESOP | Participation units      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting period (in years) 3 years    
Year three | 2006 share plan | Share appreciation rights      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting percentage   33.33%  
Year four | 2006 share plan | Share appreciation rights      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting percentage   33.33%  
Year five | 2006 share plan | Share appreciation rights      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting percentage   33.33%