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Retirement Benefit Plans - Summary of Sensitivity Analysis on Defined Obligations (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
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Actuarial assumption of discount rates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Change in defined obligation due to increase in actuarial assumption | $ (555,266) | $ (18,565) | $ (555,181)
Change in defined obligation due to decrease in actuarial assumption | 601,616 | 20,114 | 603,089
Actuarial assumption of expected rates of salary increases [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Change in defined obligation due to increase in actuarial assumption | 591,915 | 19,790 | 591,712
Change in defined obligation due to decrease in actuarial assumption | $ (545,528) | $ (18,239) | $ (547,522)

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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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