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(Increase)/decrease in working capital (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
(Increase)/decrease in working capital      
(Increase)/decrease in inventories R (3,413) R (3,214) R 1,125
(Increase)/decrease in trade receivables (2,789) (346) 2,849
Increase/(decrease) in trade payables 2,441 1,393 (2,274)
(Increase)/decrease in working capital R (3,761) R (2,167) R 1,700