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Related Party Transactions - Schedule of Loan to Related Parties (Detail) - 12 months ended Dec. 31, 2024 $ in Thousands, $ in Thousands	TWD ($)	USD ($)
Disclosure of transactions between related parties [abstract]
Loan to related parties	$ 29,960	$ 914

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- Definition

Loan to related parties.

+ References

No definition available.

+ Details

Name:	asx_LoanToRelatedParties
Namespace Prefix:	asx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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