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Leasing arrangements - leasee - Additional Information (Detail) - TWD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Leasing arrangements lessee [line items] |  |  |
Additions to right of use asset | $ 292,117 | $ 419,625 |
Payments of lease liabilities | $ 443,345 | $ 351,063 | $ 333,133
Machinery and equipment [member] |  |  |
Leasing arrangements lessee [line items] |  |  |
Lease term | 3 years |  |
Top of range [member] |  |  |
Leasing arrangements lessee [line items] |  |  |
Lease term | 30 years |  |
Top of range [member] | Land [member] |  |  |
Leasing arrangements lessee [line items] |  |  |
Lease term | 30 years |  |
Bottom of range [member] |  |  |
Leasing arrangements lessee [line items] |  |  |
Lease term | 2 years |  |
Bottom of range [member] | Land [member] |  |  |
Leasing arrangements lessee [line items] |  |  |
Lease term | 20 years |  |

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_h&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdditionsToRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_g&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CashOutflowForLeases
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease term. + References No definition available. + Details
Name: | imos_LeaseTerm
Namespace Prefix: | imos_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Leasing arrangements lessee. + References No definition available. + Details
Name: | imos_LeasingArrangementsLesseeLineItems
Namespace Prefix: | imos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_MachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |