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EMPLOYEE BENEFITS - Key management personnel remuneration (Details) - ZAR (R)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Short-term benefits      
Board fees paid R 5,600,000 R 5,000,000 R 3,700,000
Salaries paid 53,600,000 52,900,000 51,500,000
Short term incentives relating to this cycle 22,500,000 0 33,800,000
Long term incentives paid during the cycle 2,800,000 9,600,000 3,900,000
Total short term compensation 84,500,000 67,500,000 94,600,000
Long-term benefits [abstract]      
Long term incentive expense 17,200,000 10,000,000 29,900,000
Contributions to post-retirement medical benefit 400,000 400,000 300,000
Noncurrent Incentives Expense R 17,600,000 R 10,400,000 R 30,200,000