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Consolidation of Subsidiary - Information about Subsidiaries Acquired and Considerations Transferred (Detail) - TWD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Nov. 20, 2015
VisEra Holding Company [member] |  |
Disclosure of subsidiaries [line items] |  |
Principal activity | Investing in companies involved in the design, manufacturing and other related businesses in the semiconductor industry |
Date of acquisition | Nov. 20, 2015 |
Proportion of voting equity interests acquired | 49.10% |
Cash | $ 3,536.1 | $ 3,536.1
OVT Taiwan [member] |  |
Disclosure of subsidiaries [line items] |  |
Principal activity | Investment activities |
Date of acquisition | Nov. 20, 2015 |
Proportion of voting equity interests acquired | 100.00% |
Cash | $ 394.7 | $ 394.7

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- Definition The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_i&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The date on which the acquirer obtains control of the acquiree in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_b&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The description of the business or businesses that the acquirer obtains control of in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Details
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