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Application of New and Revised International Financial Reporting Standards As Issued By The International Accounting Standards Board - Summary of Lease Liabilities and Operating Lease Commitments (Parenthetical) (Detail)	Jan. 01, 2019
Disclosure Of Operating Lease Commitments [Line Items]
Incremental borrowing rate	1.35%

X

- Definition

Disclosure of operating lease commitments line items.

+ References

No definition available.

+ Details

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

X

- Definition

The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph C12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_WeightedAverageLesseesIncrementalBorrowingRateAppliedToLeaseLiabilitiesRecognisedAtDateOfInitialApplicationOfIFRS16
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant