Bonds Payable - Additional Information (Detail) - CNY (¥) ¥ / shares in Units, ¥ in Thousands	1 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2022
USISH Bonds [Member] \| USIE Investor [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings		¥ 1,444,608
Disposal of bonds	¥ 1,197,194
USISH Bonds [Member] \| ASE Investor [Member]
Disclosure of detailed information about borrowings [line items]
Disposal of bonds	¥ 28,397
USISH Bonds [Member] \| USISH [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings maturity	Within 5 trading days after maturity
Borrowings, interest rate	108.00%
Borrowings	¥ 3,450,000
Notional Amount	¥ 100
Conversion Period of Bonds	9 months
Conversion Price	¥ 20.25	¥ 19.5
Percentage of current conversion price on Stock Exchange		80.00%
Percentage of par value on USISH Bonds		102.00%
Debt conversion, original debt, amount		¥ 68
Debt conversion, converted Instrument, shares issued		3,000
USISH Bonds [Member] \| USISH [Member] \| Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Percentage of current conversion price on Stock Exchange		70.00%
Number of consecutive trading days for determining Conversion price		15 days
USISH Bonds [Member] \| USISH [Member] \| Top of range [member]
Disclosure of detailed information about borrowings [line items]
Number of consecutive trading days for determining Conversion price		30 days
USISH Bonds [Member] \| USIE and ASE (Shanghai) Inc [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings	¥ 2,670,199
Unconverted USISH Bonds [Member] \| USISH [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings		¥ 30,000
Percentage of current conversion price on Stock Exchange		130.00%
Unconverted USISH Bonds [Member] \| USISH [Member] \| Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Number of consecutive trading days for determining Conversion price		20 days
Unconverted USISH Bonds [Member] \| USISH [Member] \| Top of range [member]
Disclosure of detailed information about borrowings [line items]
Percentage of current conversion price on Stock Exchange		130.00%
Number of consecutive trading days for determining Conversion price		30 days

Conversion period of bonds.

No definition available.

Name:	asx_ConversionPeriodOfBonds
Namespace Prefix:	asx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Conversion price

+ References

No definition available.

+ Details

Name:	asx_ConversionPrice
Namespace Prefix:	asx_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt conversion, converted Instrument, shares issued.

+ References

No definition available.

+ Details

Name:	asx_DebtConversionConvertedInstrumentSharesIssued
Namespace Prefix:	asx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt conversion, original debt, amount.

+ References

No definition available.

+ Details

Name:	asx_DebtConversionOriginalDebtAmount
Namespace Prefix:	asx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Disposal of bonds.

+ References

No definition available.

+ Details

Name:	asx_DisposalOfBonds
Namespace Prefix:	asx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of consecutive trading days for determining conversion price.

+ References

No definition available.

+ Details

Name:	asx_NumberOfConsecutiveTradingDaysForDeterminingConversionPrice
Namespace Prefix:	asx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of current conversion price on Stock Exchange

+ References

No definition available.

+ Details

Name:	asx_PercentageOfCurrentConversionPriceOnStockExchange
Namespace Prefix:	asx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of par value on USISH bonds.

+ References

No definition available.

+ Details

Name:	asx_PercentageOfParValueOnUsishBonds
Namespace Prefix:	asx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_7&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

+ Details

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

- 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

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Details

Name:	asx_InvestorAxis=asx_UsieInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	asx_InvestorAxis=asx_AseInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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