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Retirement Benefit Obligation - Disclosure of Unfunded Obligations (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Balance at beginning of year R 186  
Balance at end of year 201 R 186
Current employees    
Disclosure of net defined benefit liability (asset) [line items]    
Balance at beginning of year 62  
Balance at end of year 54 62
Retired employees    
Disclosure of net defined benefit liability (asset) [line items]    
Balance at beginning of year 124  
Balance at end of year 147 124
Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Balance at beginning of year 186 179
Contributions paid (12) (10)
Other expenses included in staff costs/current service cost 3 2
Finance costs 17 18
Net actuarial (gain)/loss recognised during the year 7 (13)
Moab Khotsong acquisition (refer to note 12) 0 10
Balance at end of year R 201 R 186