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Retirement Benefit Plans - Summary of Key Assumptions Used for the Actuarial Valuations (Detail)	Dec. 31, 2020	Dec. 31, 2019
Bottom of range [member]
Disclosure of defined benefit plans [line items]
Discount rates	0.00%	0.08%
Expected rates of salary increase	1.00%	1.00%
Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rates	2.77%	2.85%
Expected rates of salary increase	4.06%	4.01%

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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X

- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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