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Contents of Significant Accounts - Sensitivity Analysis (Detail) - TWD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Discount rate [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Decrease (increase) in defined benefit obligation due to 0.5% increase in actuarial assumptions | $ 137,615 | $ 172,801
Decrease (increase) in defined benefit obligation due to 0.5% decrease in actuarial assumptions | $ (144,683) | $ (182,478)
Percentage increase in actuarial assumptions | 0.50% | 0.50%
Percentage decrease in actuarial assumptions | 0.50% | 0.50%
Rate of future salary increase [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Decrease (increase) in defined benefit obligation due to 0.5% increase in actuarial assumptions | $ (117,784) | $ (151,050)
Decrease (increase) in defined benefit obligation due to 0.5% decrease in actuarial assumptions | $ 113,478 | $ 145,000
Percentage increase in actuarial assumptions | 0.50% | 0.50%
Percentage decrease in actuarial assumptions | 0.50% | 0.50%

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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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
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