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Retirement Benefit Plans - Summary of Sensitivity of Defined Benefit Obligation to Changes in Weighted Average Assumptions (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Discount rate [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Change in Assumption | 1.00% | 1.00%
Increase in Assumption | 15.00% | 13.00%
Decrease in Assumption | 17.00% | 15.00%
Rate of increase in future compensation [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Change in Assumption | 1.00% | 1.00%
Increase in Assumption | 1.00% | 1.00%
Decrease in Assumption | 1.00% | 1.00%
Medical cost claim trend rate [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Change in Assumption | 1.00% | 1.00%
Increase in Assumption | 2.00% | 2.00%
Decrease in Assumption | 2.00% | 2.00%

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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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