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Retirement Benefit Plans - Pension Costs of Defined Benefit Plans Recognized in Profit or Loss by Categories (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 275.7 | $ 281.4 | $ 208.6
Cost of revenue [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 178.5 | 182.3 | 135.1
Research and development expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 75.3 | 76.1 | 55.6
General and administrative expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 18.4 | 19.3 | 15.1
Marketing expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 3.5 | $ 3.7 | $ 2.8

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- Definition The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [domain]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_5&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard -URIDate 2024-03-27 + Details
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