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Leasing arrangements - leasee - summary of carrying amount of right-of-use assets and the depreciation expenses (Detail) - 12 months ended Dec. 31, 2019 $ in Thousands, $ in Thousands | TWD ($) | USD ($)
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Disclosure of quantitative information about right-of-use assets [line items] |  |
Carrying amount | $ 687,068 | $ 22,971
Depreciation expenses | (36,099) |
Land [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Carrying amount | 669,967 |
Depreciation expenses | (22,657) |
Buildings [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Carrying amount | 15,043 |
Depreciation expenses | (7,113) |
Machinery and equipment [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Depreciation expenses | (4,520) |
Others [member] |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Carrying amount | 2,058 |
Depreciation expenses | $ (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 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |