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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

X
- 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

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration