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Non-current Assets Held for Sale and Discontinued Operations - Cumulative Income or Expense Recognized in Other Comprehensive Income Relating to Disposal Group Classified as Held for Sale (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 TWD ($)
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract]
Exchange differences on translation of foreign operations	$ (287,645)

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- References

No definition available.

+ Details

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

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- Definition

Cumulative income or expense recognised in other comprehensive income relating to non-current assets or disposal groups held for sale.

+ References

No definition available.

+ Details

Name:	imos_CumulativeIncomeOrExpenseRecognisedInOtherComprehensiveIncomeRelatingToNoncurrentAssetsOrDisposalGroupsHeldForSale
Namespace Prefix:	imos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration