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Business Combinations - Summary of Identification of the Difference Between the Cost of the Investment and the Group's Share of FAFG's Net Fair Value Of Identifiable Assets And Liabilities (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 ($) | Dec. 31, 2021 TWD ($)
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Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |
Trade receivables, net | $ 106,887,312 | $ 3,259,754 | $ 93,899,276 |  |  |
Inventories | 57,313,938 | 1,747,909 | 59,658,354 |  |  |
Property, plant and equipment | 312,531,471 | 9,531,304 | 264,871,522 |  |  |
Goodwill | 52,525,342 | 1,601,871 | 52,419,427 | $ 1,598,641 | $ 52,313,399 | $ 52,072,413
Other payables | 12,428,194 | 379,024 | 12,223,879 |  |  |
Deferred tax liabilities | 6,850,104 | 208,908 | 7,703,646 |  |  |
Net defined benefit liabilities | $ 2,869,587 | $ 87,514 | 3,584,736 | $ 109,324 | $ 3,784,120 | $ 5,561,596
After Retrospectively Adjusted [Member] |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |
Trade receivables, net |  |  | 99,536,761 |  |  |
Other receivables |  |  | 15,902,053 |  |  |
Current tax assets |  |  | 875,598 |  |  |
Inventories |  |  | 59,658,354 |  |  |
Other current assets |  |  | 4,973,647 |  |  |
Property, plant and equipment |  |  | 264,871,522 |  |  |
Goodwill |  |  | 52,419,427 |  |  |
Other payables |  |  | 44,556,840 |  |  |
Current tax liabilities |  |  | 9,649,556 |  |  |
Deferred tax liabilities |  |  | 7,703,646 |  |  |
Net defined benefit liabilities |  |  | 4,130,104 |  |  |
Before Retrospectively Adjusted [Member] |  |  |  |  |  |
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items] |  |  |  |  |  |
Trade receivables, net |  |  | 99,529,100 |  |  |
Other receivables |  |  | 15,611,917 |  |  |
Current tax assets |  |  | 905,345 |  |  |
Inventories |  |  | 59,606,188 |  |  |
Other current assets |  |  | 4,959,034 |  |  |
Property, plant and equipment |  |  | 264,812,022 |  |  |
Goodwill |  |  | 52,404,416 |  |  |
Other payables |  |  | 44,242,885 |  |  |
Current tax liabilities |  |  | 9,667,755 |  |  |
Deferred tax liabilities |  |  | 7,598,008 |  |  |
Net defined benefit liabilities |  |  | $ 4,122,158 |  |  |

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- Definition The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph n -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_n&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of current tax for current and prior periods to the extent unpaid. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph n -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_n&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_o&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_56&doctype=Standard -URIDate 2024-03-27 + Details
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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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- 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 [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + Details
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