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Summary of significant accounting policies - Investment property (Details)	12 Months Ended
	Jun. 30, 2018
Summary of significant accounting policies
Useful lives of investment property (in years)	50 years

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- Definition

The useful lives used for investment property, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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