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Income Tax Expense - Major Components of Income Tax Expense (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Current income tax: |  |  |  |
Current income tax on profits for the period | $ 273,836 |  | $ 426,878 | $ 771,378
Income tax on unappropriated retained earnings | 66,066 |  | 85,607 | 159,744
Prior year income tax overestimation | (127,768) |  | (182,778) | (255,935)
Total current income tax | 212,134 |  | 329,707 | 675,187
Deferred income tax: |  |  |  |
Relating to origination and reversal of temporary differences | (4,617) |  | (29,046) | (87,012)
Income tax expense | $ 207,517 | $ 6,328 | $ 300,661 | $ 588,175

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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 80 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_80_a&doctype=Standard -URIDate 2024-03-27 + Details
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