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EMPLOYEE BENEFITS - Narrative (Details) - Phantom shares [Member]
12 Months Ended
Jun. 30, 2018
ZAR (R)
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Finite term of incentive term 5 years
Phantom share exercise price R 0
3 years [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Percentage of shares vested 20.00%
4 years [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Percentage of shares vested 30.00%
5 years [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Percentage of shares vested 50.00%