XML 202 R186.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Non-cash Transactions - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 TWD ($)
Disclosure Of Non Cash Investing Activities [Line Items] |  |  |
Issue of ordinary shares under conversion of bonds | $ 13,900,482 |  | $ 214,022
Share capital [member] |  |  |
Disclosure Of Non Cash Investing Activities [Line Items] |  |  |
Issue of ordinary shares under conversion of bonds | 4,242,577 | $ 143,137 |
Capital surplus [member] |  |  |
Disclosure Of Non Cash Investing Activities [Line Items] |  |  |
Issue of ordinary shares under conversion of bonds | $ 9,657,905 | $ 325,840 | $ 214,022

X
- Definition Disclosure Of Non Cash Investing Activities [Line Items] + References No definition available. + Details
Name: | asx_DisclosureOfNonCashInvestingActivitiesLineItems
Namespace Prefix: | asx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in equity resulting from the conversion of convertible instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_IssuedCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_SharePremiumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |