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Other Reserves - Reconciliation of Post Retirement Benefit Reserve (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of reserves within equity [abstract]    
Balance at beginning of year R (12) R (25)
Actuarial gain/(loss) (7) 14
Deferred tax 0 (1)
Balance at end of year R (19) R (12)