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Decrease/(increase) in working capital (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Decrease/(increase) in working capital      
Increase in inventories R (829) R (3,413) R (3,214)
Decrease/(increase) in trade receivables 37 (2,789) (346)
Increase in trade payables 3,202 2,441 1,393
Decrease/(increase) in working capital R 2,410 R (3,761) R (2,167)