Retirement Benefit Plans - Summary of Sensitivity of Defined Benefit Obligation to Changes in Weighted Average Assumptions (Detail)	Dec. 31, 2020	Dec. 31, 2019
Discount rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in Assumption	1.00%	1.00%
Increase in Assumption	(1200.00%)	(1200.00%)
Decrease in Assumption	1400.00%	1400.00%
Rate of increase in future compensation
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in Assumption	1.00%	1.00%
Increase in Assumption	100.00%	100.00%
Decrease in Assumption	(100.00%)	(100.00%)
Medical cost claim trend rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in Assumption	1.00%	1.00%
Increase in Assumption	100.00%	100.00%
Decrease in Assumption	(100.00%)	(100.00%)

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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 2020-01-01
-Paragraph 145
-Subparagraph a
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Percentage Increase (Decrease) In Defined Benefit Obligation Due To Reasonably Possible Decrease In Actuarial Assumption

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Percentage Increase (Decrease) In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption

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