XML 190 R172.htm IDEA: XBRL DOCUMENT v3.22.1

Income Tax - Summary of Projects were Exempted From Income Tax (Detail) - Construction and expansion of 2009 [member] - ASE Test, Inc. [member]	12 Months Ended
	Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax-exemption period, start date	2018-01
Tax-exemption period, end date	2022-12

X

- Definition

Tax exemption period end date.

+ References

No definition available.

+ Details

Name:	asx_TaxExemptionPeriodEndDate
Namespace Prefix:	asx_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax exemption period start date.

+ References

No definition available.

+ Details

Name:	asx_TaxExemptionPeriodStartDate
Namespace Prefix:	asx_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

Name:	ifrs-full_TypesOfInvestmentPropertyAxis=asx_ConstructionAndExpansionOfTwoThousandAndNineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASETestIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: