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Investment Properties - Summary of Maturity Analysis Of Operating Lease Payments (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
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Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | $ 9,500,632 | $ 342,489 | $ 3,424,290
Year 1 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 1,693,659 | 61,055 | 880,929
Year 2 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 1,405,450 | 50,666 | 688,123
Year 3 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 1,210,891 | 43,651 | 471,966
Year 4 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 1,019,498 | 36,752 | 383,307
Year 5 [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | 929,609 | 33,511 | 335,706
Year 6 onwards [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Undiscounted operating lease payments to be received | $ 3,241,525 | $ 116,854 | $ 664,259

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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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