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Employee Benefit - Sensitivity Analysis of One-percentage Point Change in Assumed Rates (Parenthetical) (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Discount rate [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Rate increase | 1.00% | 1.00%
Rate decrease | 1.00% | 1.00%
Rate of salary increase [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Rate increase | 1.00% | 1.00%
Rate decrease | 1.00% | 1.00%

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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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