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Property, Plant and Equipment - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Bottom of range [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Operating lease term | 1 year | 1 year |
Top of range [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Operating lease term | 5 years | 5 years |
Main plants [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Estimated useful lives for property, plant and equipment | 20 years |  |
Mechanical and electrical power equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Estimated useful lives for property, plant and equipment | 10 years |  |
Clean rooms [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Estimated useful lives for property, plant and equipment | 10 years |  |
Machinery and equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Reversal of impairment | $ 274.4 |  | $ 301.4

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- Definition The amount of reversal of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Reversal of impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e_vi&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_98_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Details
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- Details
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- Details
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