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Earnings per share - Additional Information (Detail) - shares	Jun. 30, 2021	Jun. 30, 2020
Treasury shares [member]
Earnings per share [line items]
Ordinary shares in issue	70,489,953	70,750,170
Ordinary shares [member]
Earnings per share [line items]
Ordinary shares in issue	1,270,102,274	1,296,079,242

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 106
-Subparagraph d
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-URIDate 2020-01-01

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- Details

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- Details

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