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Retirement Benefit Plans - Summary of Defined Benefit Plans Amounts Included in Consolidated Balance Sheets (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
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Disclosure of net defined benefit liability (asset) [abstract] |  |  |  |  |  |
Present value of the defined benefit obligation | $ 10,261,997 | $ 333,941 | $ 11,424,860 |  |  |
Fair value of the plan assets | (6,477,877) | (210,800) | (5,863,264) |  |  |
Present value of unfunded defined benefit obligation | 3,784,120 | 123,141 | 5,561,596 | $ 180,983 | $ 6,196,840 | $ 4,926,396
Recorded under other payables | (88,983) | (2,896) | (67,524) |  |  |
Recorded under other non-current assets | 248,843 | 8,098 |  |  |  |
Net defined benefit liability | $ 3,943,980 | $ 128,343 | $ 5,494,072 |  |  |

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- Definition Defined benefit plan recorded under others payables. + References No definition available. + Details
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- Definition Net defined benefit liability. + References No definition available. + Details
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- Definition Recorded under other non current assets. + References No definition available. + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_140_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard -URIDate 2022-03-24 + Details
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