XML 137 R121.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Borrowings - Summary of Long-term Bills Payable (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
China Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 0.96% |
Borrowings maturity | February 2019 |
International Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 0.96% |
Borrowings maturity | March 2019 |
Ta Ching Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates |  | 1.00%
Borrowings maturity |  | December 2017

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_BorrowingsMaturity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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 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
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=asx_ChinaBillsFinanceCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=asx_InternationalBillsFinanceCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=asx_TaChingBillsFinanceCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |