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Share Options - Joint Share Ownership Plan (Details)	12 Months Ended
	Jun. 30, 2018 year shares	Jun. 30, 2017 year shares
Joint Share Ownership Plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expiration period	25 years
Number of shares in entity held by entity or by its subsidiaries or associates (in shares)	3,440,465	3,440,465
Weighted average remaining contractual life | year	19	20
Joint Share Ownership Plan - EBT Portion
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares in entity held by entity or by its subsidiaries or associates (in shares)	4,703,980	4,703,980

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Share-based Compensation Arrangement By Share-based Payment Award, Expiration Period1

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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 number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 79
-Subparagraph a
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- Definition

The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph d
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-URIDate 2017-03-09

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