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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, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Disclosure of net defined benefit liability (asset) [abstract] |  |  |
Present value of the defined benefit obligation | $ 10,123,897 | $ 308,749 | $ 10,201,794
Fair value of the plan assets | (7,254,310) | (221,235) | (6,617,058)
Net defined benefit liabilities | 2,869,587 | 87,514 | 3,584,736
Recorded under other payables | (18,622) | (568) | (20,281)
Recorded under other non-current assets | 164,176 | 5,007 | 181,844
Recorded under net defined benefit liabilities | $ 3,015,141 | $ 91,953 | $ 3,746,299

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- Definition Defined benefit plan recorded under others payables. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net defined benefit liability. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Recorded under net defined benefit liabilities. + References No definition available. + Details
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Balance Type: | credit
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- Definition Recorded under other non current assets. + References No definition available. + Details
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Balance Type: | credit
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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 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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- References No definition available. + 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 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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