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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 281.8 | $ 271.5 | $ 272.2
Cost of revenue [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 177.8 | 175.3 | 177.0
Research and development expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 79.1 | 75.3 | 73.4
General and administrative expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | 20.6 | 16.7 | 17.4
Marketing expenses [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit cost recognized in the income statement | $ 4.3 | $ 4.2 | $ 4.4

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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 2018-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_5&doctype=Standard -URIDate 2018-03-16 + Details
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