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v3.25.1

Pledged assets - Certain Assets Provided as Collateral Mainly for Long-term Bank Loans and Leases (Detail) - TWD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure assets pledged as collateral [Line Items] |  |
Purpose | Lease |
Non-current financial assets at amortized cost | $ 43,034 | $ 37,411
Assets pledged as collateral for liabilities | $ 13,393,118 | 13,964,988
Land [member] |  |
Disclosure assets pledged as collateral [Line Items] |  |
Purpose | Bank loan |
Property, plant and equipment, net | $ 454,738 | 454,738
Buildings [member] |  |
Disclosure assets pledged as collateral [Line Items] |  |
Purpose | Bank loan |
Property, plant and equipment, net | $ 5,722,487 | 5,299,221
Machinery and equipment [member] |  |
Disclosure assets pledged as collateral [Line Items] |  |
Purpose | Bank loan |
Property, plant and equipment, net | $ 7,172,859 | $ 8,173,618

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- Definition The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 15 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_15_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 74 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_74_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Description of borrowings purpose. + References No definition available. + Details
Name: | imos_DescriptionOfBorrowingsPurpose
Namespace Prefix: | imos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure assets pledged as collateral. + References No definition available. + Details
Name: | imos_DisclosureAssetsPledgedAsCollateralLineItems
Namespace Prefix: | imos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Non-current pledged collateral assets at amortised cost. + References No definition available. + Details
Name: | imos_NoncurrentPledgedCollateralAssetsAtAmortisedCost
Namespace Prefix: | imos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=imos_MachineryAndEquipment1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |