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RESULTS FROM OPERATING ACTIVITIES - Aministration expenses and other costs (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure Of Operating Activities [Abstract]      
Increase in long term incentive liability R 17.2 R 10.0 R 29.9
Transactions costs incurred related to the acquisition of FWGR (9.0) 0.0 0.0
Losses on disposals of property, plant and equipment R (0.6) R 0.0 R 0.0