XML 154 R135.htm IDEA: XBRL DOCUMENT
v3.19.1

Bonds Payable - Summary of Bonds Payable (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2015
--- | --- | --- | ---
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% |
US$200,000 thousand [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional Amount | $ 200,000 |  | $ 200,000

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + 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_UnsecuredOverseasConvertibleBondsTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |