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Retained Earnings - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2024
Increase Decrease Through Appropriation Of Retained Earnings [Abstract]
Legal capital reserve percentage of remaining profit	10.00%
Cash dividend percentage on dividend distribution	10.00%
Percentage of paid in capital on reserve used to offset deficit or distribute as dividend in cash or stock	25.00%

X

- Definition

Cash dividend percentage on dividend distribution.

+ References

No definition available.

+ Details

Name:	imos_CashDividendPercentageOnDividendDistribution
Namespace Prefix:	imos_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Increase Decrease Through Appropriation Of Retained Earnings​ [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

Legal capital reserve percentage of remaining profit.

+ References

No definition available.

+ Details

Name:	imos_LegalCapitalReservePercentageOfRemainingProfit
Namespace Prefix:	imos_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of paid in capital on reserve used to offset deficit or distribute as dividend in cash or stock.

+ References

No definition available.

+ Details

Name:	imos_PercentageOfPaidInCapitalOnReserveUsedToOffsetDeficitOrDistributeAsDividendInCashOrStock
Namespace Prefix:	imos_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration