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Financial risk management and financial instruments - Capital Allocation (Details)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Capital allocation
Targeted gearing ratio, temporary maximum until 2019	44.00%
Actual gearing level	43.20%	26.70%	(14.60%)
Minimum
Capital allocation
Targeted gearing ratio	20.00%
Maximum
Capital allocation
Targeted gearing ratio	40.00%

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The entity's actual gearing ratio for the period, calculated as net borrowings divided by shareholders' equity.

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The entity's targeted gearing ratio, calculated as net borrowings divided by shareholders' equity.

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The temporarily lifted maximum for the targeted gearing ratio, calculated as net borrowings divided by shareholders' equity, applicable through the end of the next fiscal year.

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