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Accounts payable - Summary of Accounts Payable (Detail) - TWD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Statement [LineItems] |  |
Trade and other payables | $ 966,821 | $ 819,548
Account payable [Member] |  |
Statement [LineItems] |  |
Trade and other payables | 766,805 | 419,520
Estimated account payable [Member] |  |
Statement [LineItems] |  |
Trade and other payables | $ 200,016 | $ 400,028

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- Definition The amount of trade payables and other payables. [Refer: Trade payables; Other payables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph k -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_k&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | imos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=imos_AccountPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=imos_EstimatedAccountPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |