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Property, Plant and Equipment - Summary of maturity analysis of operating lease payments receivable (Detail) - Operating Lease Agreement [Member] - TWD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Maturity Analysis Of Operating Lease Receivables [Line Items] |  |
Operating Lease Payment Receivables | $ 18.0 | $ 166.1
Year 1 [member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Receivables [Line Items] |  |
Operating Lease Payment Receivables | $ 18.0 | 149.1
Year 2 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Receivables [Line Items] |  |
Operating Lease Payment Receivables |  | $ 17.0

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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_97&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of maturity analysis of operating lease receivables + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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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: |