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Property, Plant and Equipment, Net - Capitalization Interest and Capitalization Interest Rate Applied Related to Property, Plant and Equipment (Detail) - TWD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [abstract] |  |  |
Capitalization interest | $ 9,762 | $ 15,114 | $ 18,542
Capitalization interest rate applied | 1.4909% | 1.7822% | 1.7582%

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2020-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2020-en-r&anchor=para_26_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2020-01-01 -Paragraph 26 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2020-en-r&anchor=para_26_b&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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