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Significant contingent liabilities and unrecognized contract commitments - Additional Information (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Capital commitments [abstract]
Amounts guaranteed by the financial institutions	$ 137,700	$ 99,000

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- References

No definition available.

+ Details

Name:	ifrs-full_CapitalCommitmentsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Bank guarantees.

+ References

No definition available.

+ Details

Name:	imos_BankGuarantees
Namespace Prefix:	imos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant