XML 117 R94.htm IDEA: XBRL DOCUMENT v3.21.1

The authorization of the consolidated financial statements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Date of authorization of financial statements by Board of directors	Apr. 20, 2021

X

- Definition

The date on which financial statements are authorised for issue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 10
-IssueDate 2020-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=10&code=ifrs-tx-2020-en-r&anchor=para_17&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_DateOfAuthorisationForIssueOfFinancialStatements2013
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Text block [abstract]

+ References

No definition available.

+ Details

Name:	imos_TextBlockAbstract
Namespace Prefix:	imos_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration