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Significant Commitments and Contingencies - Additional Information (Detail) - TWD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Capital commitments [abstract]
Amount guaranteed by Bank of Taiwan	$ 100,800	$ 97,500

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- References

No definition available.

+ Details

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

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- Definition

Bank guarantees.

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No definition available.

+ Details

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