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Income tax benefit - Summary of Income tax benefit (Parenthetical) (Detail) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure Of Income Tax Benefit [Line Items] |  |  |
Statutory tax rate | 27.50% | 27.50% | 30.00%
US [member] |  |  |
Disclosure Of Income Tax Benefit [Line Items] |  |  |
Statutory tax rate | 21.00% | 21.00% | 21.00%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosure of income tax benefit [Line Items] + References No definition available. + Details
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- Details
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