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Goodwill - Summary of Carrying Amounts of Goodwill Allocated to Cash-generating Units (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
--- | --- | --- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | $ 52,525,342 | $ 1,601,871 | $ 52,419,427 | $ 1,598,641 | $ 52,313,399 | $ 52,072,413
Packaging segment [member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | 35,437,523 | 1,080,742 | 35,426,817 |  |  |
Testing segment [member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | 13,489,766 | 411,399 | 13,414,094 |  |  |
EMS Segment [Member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | 3,449,952 | 105,214 | 3,430,415 |  |  |
All other segments [member] |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |
Goodwill | $ 148,101 | $ 4,516 | $ 148,101 |  |  |

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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 134 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_134_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_135_a&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_c&doctype=Standard -URIDate 2024-03-27 + Details
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