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Retirement Benefit Plans - Summary of Sensitivity Analysis on Defined Obligations (Parenthetical) (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Actuarial assumption of discount rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage increase in actuarial assumption | 0.50% | 0.50%
Percentage decrease in actuarial assumption | 0.50% | 0.50%
Actuarial assumption of expected rates of salary increases [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage increase in actuarial assumption | 0.50% | 0.50%
Percentage decrease in actuarial assumption | 0.50% | 0.50%

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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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