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Retirement Benefit Plans - Summary of Maturity Analysis of Undiscounted Pension Benefit (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
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Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | $ 14,720,029 | $ 492,143 | $ 15,578,025
Less than 1 year [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | 422,067 | 14,111 | 368,592
1-5 years [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | 2,081,540 | 69,593 | 1,886,738
More than 5 years [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Maturity analysis of undiscounted pension benefit | $ 12,216,422 | $ 408,439 | $ 13,322,695

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- Definition The present value of the expected payments by a retirement benefit plan to existing and past employees, attributable to the service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_d&doctype=Standard -URIDate 2019-03-27 + Details
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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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- Details
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- Details
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