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Cash-settled share-based payment provision - Assumptions used to calculate share-based payment expense (Details) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
SARs with no CPTs |  |
Share-based payment transaction |  |
Expected volatility | 28.61% | 20.86%
Expected dividend yield | 3.58% | 3.42%
SARs with CPTs |  |
Share-based payment transaction |  |
Expected volatility | 27.16% | 24.45%
Expected dividend yield | 3.51% | 3.42%
Expected forfeiture rate | 5.00% | 9.00%
Minimum | SARs with no CPTs |  |
Share-based payment transaction |  |
Risk - free interest rate | 6.88% | 7.03%
Minimum | SARs with no CPTs issued between 2009-2011 |  |
Share-based payment transaction |  |
Vesting period | 2 years | 2 years
Minimum | SARs with CPTs |  |
Share-based payment transaction |  |
Risk - free interest rate | 6.88% | 7.03%
Minimum | SARs with CPTs issued between 2009-2011 |  |
Share-based payment transaction |  |
Vesting period | 2 years | 2 years
Minimum | SARs with CPTs issued between 2012-2014 |  |
Share-based payment transaction |  |
Vesting period | 3 years | 3 years
Middle | SARs with no CPTs issued between 2009-2011 |  |
Share-based payment transaction |  |
Vesting period | 4 years | 4 years
Middle | SARs with CPTs issued between 2009-2011 |  |
Share-based payment transaction |  |
Vesting period | 4 years | 4 years
Middle | SARs with CPTs issued between 2012-2014 |  |
Share-based payment transaction |  |
Vesting period | 4 years | 4 years
Maximum | SARs with no CPTs |  |
Share-based payment transaction |  |
Risk - free interest rate | 7.09% | 8.75%
Maximum | SARs with no CPTs issued between 2009-2011 |  |
Share-based payment transaction |  |
Vesting period | 6 years | 6 years
Maximum | SARs with CPTs |  |
Share-based payment transaction |  |
Risk - free interest rate | 7.63% | 8.75%
Maximum | SARs with CPTs issued between 2009-2011 |  |
Share-based payment transaction |  |
Vesting period | 6 years | 6 years
Maximum | SARs with CPTs issued between 2012-2014 |  |
Share-based payment transaction |  |
Vesting period | 5 years | 5 years

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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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 percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The percentage of expected forfeiture rate used to calculate the fair value of share granted. + References No definition available. + Details
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- Definition The vesting life of awards in a share-based payment arrangement. + References No definition available. + Details
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