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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 208.6 | $ 192.5 | $ 204.9
Cost of revenue [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 135.1 | 124.5 | 126.3
Research and development expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 55.6 | 52.8 | 57.3
General and administrative expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 15.1 | 12.5 | 18.2
Marketing expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 2.8 | $ 2.7 | $ 3.1

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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 [member]] [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 2022-03-24 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_5&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_135_b&doctype=Standard -URIDate 2022-03-24 + Details
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