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Retirement Benefit Plans - Sensitivity Analysis of Present Value of Defined Benefit Obligations Effected by Changes of Significant Actuarial Assumptions (Detail) - TWD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Actuarial assumption of discount rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Percentage increase in assumption | 0.25% | 0.25%
Effect on present value of defined benefit obligations due to increase in assumption | $ (27,993) | $ (29,052)
Percentage decrease in assumption | 0.25% | 0.25%
Effect on present value of defined benefit obligations due to decrease in assumption | $ 29,284 | $ 30,430
Actuarial assumption of expected rates of salary increases [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Percentage increase in assumption | 0.25% | 0.25%
Effect on present value of defined benefit obligations due to increase in assumption | $ 28,501 | $ 29,692
Percentage decrease in assumption | 0.25% | 0.25%
Effect on present value of defined benefit obligations due to decrease in assumption | $ (27,407) | $ (28,513)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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