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Post-Retirement Obligation- Summary of Sensitivity Analysis of the Effects of Changes in the Principal Actuarial Assumptions Used to Determine the Defined-benefit Obligation (Parenthetical) (Detail)	Dec. 31, 2017
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	1.00%
Pension plans and retirement supplement plans [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	1.00%
Health plan [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	1.00%
Dental plan [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	1.00%
Life insurance [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount rate	1.00%

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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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- 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
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-URIDate 2017-03-09

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