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v3.23.1

Related Party Transactions - Additional Information (Detail) $ in Thousands | Sep. 30, 2021 TWD ($)
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HC associates [Member] |
Disclosure of transactions between related parties [line items] |
Real estate properties acquired | $ 2,362,000

X
- Definition Real estate property recognised as of acquisition date. + References No definition available. + Details
Name: | asx_RealEstatePropertyRecognisedAsOfAcquisitionDate
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=asx_HcAssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |