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Leasing arrangements - leasee - summary of carrying amount of right-of-use assets and the depreciation expenses (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Carrying amount | $ 835,805 | $ 859,069 |  | $ 30,130
Depreciation expenses | 279,080 | 76,526 | $ 36,099 |
Land [member] |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Carrying amount | 616,458 | 636,261 |  |
Depreciation expenses | 20,486 | 20,938 | 22,657 |
Buildings [member] |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Carrying amount | 10,946 | 19,044 |  |
Depreciation expenses | 9,870 | 7,819 | 7,113 |
Machinery and equipment [member] |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Carrying amount | 204,484 | 203,249 |  |
Depreciation expenses | 247,090 | 46,225 | 4,520 |
Others [member] |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Carrying amount | 3,917 | 515 |  |
Depreciation expenses | $ 1,634 | $ 1,544 | $ 1,809 |

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&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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- Details
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