XML 183 R160.htm IDEA: XBRL DOCUMENT v3.21.1

Significant contingent liabilities and unrecognized contract commitments - Additional Information (Detail) - TWD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Capital commitments [abstract]
Amount guaranteed by Bank of Taiwan	$ 99,000	$ 100,800

X

- References

No definition available.

+ Details

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

X

- Definition

Bank guarantees.

+ References

No definition available.

+ Details

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