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Net Finance Costs - Summary of Net Finance Costs (Parenthetical) (Detail) | 6 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of finance income costs [abstract] |  |  |
Interest capitalised | 4.94% | 3.86% | 4.24%

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- Definition Disclosure of finance income costs. + References No definition available. + Details
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- Definition The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2018-01-01 -Paragraph 26 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2018-03-01&anchor=para_26_b&doctype=Standard -URIDate 2018-03-16 + Details
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