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(Increase)/decrease in working capital (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
(Increase)/decrease in working capital      
(Increase)/decrease in inventories R (4,872) R 3,397 R (829)
(Increase)/decrease in trade receivables (7,198) 6,431 37
Increase/(decrease) in trade payables 4,916 (3,990) 3,202
(Increase)/decrease in working capital R (7,154) R 5,838 R 2,410