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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 204.9 | $ 259.6 | $ 281.8
Cost of revenue [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 126.3 | 157.8 | 177.8
Research and development expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 57.3 | 72.7 | 79.1
General and administrative expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 18.2 | 25.1 | 20.6
Marketing expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 3.1 | $ 4.0 | $ 4.3

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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_5&doctype=Standard -URIDate 2020-01-01 + Details
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