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Financial risk management and financial instruments - Credit Risk (Details) - customer | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Credit risk |  |  |
Loss given default for unsecured financial assets | 50.00% | 50.00% |
Loss given default for secured financial assets | 40.00% | 40.00% |
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
Minimum |  |  |
Credit risk |  |  |
Contractual payment terms for receivables | 30 days |  |
Maximum |  |  |
Credit risk |  |  |
Contractual payment terms for receivables | 120 days |  |
South Africa |  |  |
Credit risk |  |  |
Percentage of total turnover | 48.00% | 42.00% | 44.00%
Europe |  |  |
Credit risk |  |  |
Percentage of total turnover | 21.00% | 24.00% | 23.00%
United States |  |  |
Credit risk |  |  |
Percentage of total turnover | 16.00% | 18.00% | 17.00%

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