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Cash and Cash Equivalents - Additional Information (Detail)	Dec. 31, 2019 TWD ($)
Cash and cash equivalents [abstract]
Cash and cash equivalents pledge	$ 0

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
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- Definition

Cash and cash equivalents pledged.

+ References

No definition available.

+ Details

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