XML 216 R197.htm IDEA: XBRL DOCUMENT v3.19.1

Disposal of Subsidiaries - Summary of Gain on Disposal of Subsidiaries (Detail) - TWD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2017
Disclosure of gain from disposals of subsidiaries [line items]
Total consideration		$ (7,046,464)
KSDY [member]
Disclosure of gain from disposals of subsidiaries [line items]
Total consideration	$ 7,046,464
Net assets disposed of	(1,457,007)
Gain on disposal of KSDY	$ 5,589,457

X

- Definition

Disclosure of gain from disposals of subsidiaries [line items]

+ References

No definition available.

+ Details

Name:	asx_DisclosureOfGainFromDisposalsOfSubsidiariesLineItems
Namespace Prefix:	asx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Gain on disposal of subsidiaries.

+ References

No definition available.

+ Details

Name:	asx_GainOnDisposalOfSubsidiaries
Namespace Prefix:	asx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of assets, other than cash or cash equivalents, in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 40
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_d&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_AssetsOtherThanCashOrCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 40
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_a&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ConsiderationPaidReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_KSDYMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: