XML 192 R138.htm IDEA: XBRL DOCUMENT
v3.20.1

Bonds Payable - Summary of Bonds Payable (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Repayable at maturity in January 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 1.30% | 1.30%
Repayable at maturity in January 2023 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 1.50% | 1.50%
Repayable at maturity in January 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 1.25% | 1.25%
Repayable at maturity in January 2024 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 1.45% | 1.45%
Repayable at maturity in April 2024 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 0.90% | 0.90%
Repayable at maturity in April 2026 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 1.03% | 1.03%
Repayable at maturity in October 2022 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 2.15% | 2.15%
Notional Amount | $ 200,000 | $ 200,000
Repayable at maturity in October 2024 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 2.50% | 2.50%
Notional Amount | $ 100,000 | $ 100,000
Repayable at maturity in December 2020 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 0.00% |

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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
- 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInJanuaryTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInJanuaryTwoThousandTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInJanuaryTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInJanuaryTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInAprilTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInAprilTwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInOctoberTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInOctoberTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=asx_RepayableAtMaturityInDecemberTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |