XML 44 R25.htm IDEA: XBRL DOCUMENT
v3.19.1

Long-term Prepayments for Lease | 12 Months Ended
--- | ---
Dec. 31, 2018
Text block [abstract] |
Long-term Prepayments for Lease |
| 20. | LONG-TERM PREPAYMENTS FOR LEASE
Long-term prepayments for lease mainly represented land use rights located in China with periods for use from 30 to 70 years and will expire through 2048 to 2089.

X
- Definition Text block [abstract] + References No definition available. + Details
Name: | asx_TextBlockAbstract
Namespace Prefix: | asx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of lease prepayments. [Refer: Prepayments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DisclosureOfLeasePrepaymentsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration