XML 152 R136.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Equity - Summary of Capital Surplus (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Disclosure of classes of share capital [abstract] |  |  |
Arising from issuance of ordinary shares | $ 21,553,853 | $ 727,188 | $ 5,844,397
Arising from conversion of bond payable | 1,930,066 | 65,117 |
Arising from the difference between consideration received and the carrying amount of the subsidiaries' net assets during actual disposal or acquisition | 7,176,958 | 242,137 | 7,176,958
Arising from changes in percentage of ownership interest in subsidiaries | 6,084,895 | 205,293 | 6,134,228
Arising from treasury share transactions | 1,151,345 | 38,844 | 950,368
Arising from exercised employee share options | 1,089,178 | 36,747 | 630,411
Arising from expired employee share options | 223,454 | 7,539 | 3,626
Arising from share of changes in capital surplus of associates | 83,733 | 2,825 | 82,243
Arising from employee share options | 960,888 | 32,419 | 1,230,247
Arising from equity component of convertible bonds | 214,022 | 7,221 | 214,022
Others | 155,936 | 5,261 |
Capital surplus | $ 40,624,328 | $ 1,370,591 | $ 22,266,500

X
- Definition Changes in percentage of ownership interest in subsidiaries. + References No definition available. + Details
Name: | asx_ChangesInPercentageOfOwnershipInterestInSubsidiaries
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Conversion of bond payable. + References No definition available. + Details
Name: | asx_ConversionOfBondPayable
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Difference between consideration received or paid and carrying amount of subsidiaries' net assets upon actual disposal or acquisition effect on additional paid-in capital. + References No definition available. + Details
Name: | asx_DifferenceBetweenConsiderationReceivedOrPaidAndCarryingAmountOfSubsidiariesNetAssetsUponActualDisposalOrAcquisitionEffectOnAdditionalPaidinCapital
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Employee share options. + References No definition available. + Details
Name: | asx_EmployeeShareOptions
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Exercised employee share options. + References No definition available. + Details
Name: | asx_ExercisedEmployeeShareOptions
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Expired employee share options. + References No definition available. + Details
Name: | asx_ExpiredEmployeeShareOptions
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Issuance of share value. + References No definition available. + Details
Name: | asx_IssuanceOfShareValue
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Share of changes in capital surplus of associates. + References No definition available. + Details
Name: | asx_ShareOfChangesInCapitalSurplusOfAssociates
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Treasury stock transactions. + References No definition available. + Details
Name: | asx_TreasuryStockTransactions
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_OtherReserves
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A component of equity representing components of convertible instruments classified as equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ReserveOfEquityComponentOfConvertibleInstruments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount received or receivable from the issuance of the entity's shares in excess of nominal value. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_SharePremium
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant