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Investment Properties - Summary of Maturity Analysis Of Operating Lease Payments (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | $ 6,590,037 | $ 200,977 | $ 7,443,573
Year 1 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 1,553,091 | 47,365 | 1,596,827
Year 2 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 1,333,489 | 40,668 | 1,333,442
Year 3 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 1,041,709 | 31,769 | 1,154,877
Year 4 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 768,824 | 23,447 | 893,353
Year 5 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 644,958 | 19,669 | 687,266
Year 6 onwards [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | $ 1,247,966 | $ 38,059 | $ 1,777,808

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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 2024-01-01 -Paragraph 97 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_97&doctype=Standard -URIDate 2024-03-27 + Details
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