XML 143 R139.htm IDEA: XBRL DOCUMENT v3.20.1

Treasury Stock - Additional Information (Detail) shares in Thousands, $ in Thousands	5 Months Ended
	Aug. 06, 2019 TWD ($) shares
Statement [line items]
Approval for number of treasury stock cancelled | shares	25,570
Cancellation of treasury stock | $	$ 962,503

X

- Definition

The amount of treasury stock cancelled during the period. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Approval for number of treasury shares cancelled.

+ References

No definition available.

+ Details

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Namespace Prefix:	imos_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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