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Summary of significant accounting policies - Intangible assets - Goodwill (Details)	Jun. 30, 2018 item
Summary of significant accounting policies
Number of material cash generating units for impairment review	1

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- Definition

No definition available.

+ References

No definition available.

+ Details

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- Definition

The number of material cash generating units for the purposes of the annual impairment review.

+ References

No definition available.

+ Details

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