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Borrowings - Additional Information (Detail) - Dec. 31, 2024 - ASX Bank Loans [Member] $ in Thousands, $ in Thousands	TWD ($)	USD ($)
January To March 2024 [Member]
Disclosure of detailed information about borrowings [line items]
Amount of bank loan repaid	$ 16,461,821
January To March 2025 [Member]
Disclosure of detailed information about borrowings [line items]
Amount of bank loan repaid	$ 28,489,463	$ 868,846

X

- Definition

Amount of bank loan settled.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=asx_AsxBankLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	asx_SettlementAxis=asx_JanuaryToMarch2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	asx_SettlementAxis=asx_JanuaryToMarch2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: