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Other Income - Summary of Other income (Detail) - TWD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Analysis of other income [Abstract] |  |  |
Rental income | $ 48,264 | $ 35,848 | $ 17,326
Grant income | 22,727 | 21,327 | 12,480
Dividend income | 6,592 | 9,816 | 4,690
Other non-operating income (expenses), net | $ 77,583 | $ 66,991 | $ 34,496

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- Definition The amount of income recognised from rental activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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Period Type: | duration

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- Definition Analysis of other income. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Grant Income. + References No definition available. + Details
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Namespace Prefix: | imos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other non operating income expense. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration