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Related Party Transactions - Additional Information (Detail) $ in Thousands	Sep. 30, 2021 TWD ($)
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: