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Financial risk management and financial instruments - Credit Risk (Details) - customer | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Credit risk |  |  |
Number of customers representing more than ten percent of turnover | 0 | 0 | 0
Number of customers representing more than ten percent of trade receivables | 0 | 0 | 0
South Africa |  |  |
Credit risk |  |  |
Percentage of total turnover | 49.00% | 48.00% | 47.00%
Europe |  |  |
Credit risk |  |  |
Percentage of total turnover | 24.00% | 22.00% | 23.00%
United States of America |  |  |
Credit risk |  |  |
Percentage of total turnover | 13.00% | 13.00% | 14.00%

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