XML 170 R85.htm IDEA: XBRL DOCUMENT
v3.20.1

Summary of Significant Accounting Policies - Summary of Subsidiaries (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
ASE [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
A.S.E. Holding Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Bermuda |
Percentage of Ownership (%) |  | 100.00% | 100.00%
J & R Holding Limited ("J&R Holding") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Bermuda |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Innosource Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Omniquest Industrial Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Marketing & Service Japan Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in marketing and sales services |
Establishment and Operating Location |  | Japan |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Test, Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the testing of semiconductors |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Luchu Development Corporation [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the development of real estate properties |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 86.10% | 86.10%
TLJ Intertech Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in information software services |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 60.00% | 60.00%
MingFeng Information Service Corp., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in information software services, and was established in May 2018. |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Embedded Electronics Inc. ("ASEEE") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the sale and manufacturing of embedded substrate |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) | 100.00% | 100.00% |
Advanced Microelectronic Products Inc. ("AMPI") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the manufacturing of integrated circuit |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 51.00% |
Alto Enterprises Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Super Zone Holdings Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Hong Kong |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE (Kun Shan) Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Kun Shan, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Investment (Kun Shan) Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Kun Shan, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Advanced Semiconductor Engineering (China) Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Will engage in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Investment (Labuan) Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Malaysia |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Test Limited ("ASE Test") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Singapore |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Japan Co., Ltd. ("ASE Japan") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Japan |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE (U.S.) Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | After-sales service and sales support |
Establishment and Operating Location |  | U.S.A. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Global Advanced Packaging Technology Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Cayman Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE WeiHai Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Shandong, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Suzhou ASEN Semiconductors Co., Ltd. ("ASEN") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Suzhou, China |
Percentage of Ownership (%) |  | 100.00% | 70.00%
Anstock Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in financing activity |
Establishment and Operating Location |  | British Cayman Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Anstock II Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in financing activity |
Establishment and Operating Location |  | British Cayman Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE (Shanghai) Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the production of substrates |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Corporation [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Cayman Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Mauritius Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Mauritius |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Labuan Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Malaysia |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Shanghai Ding Hui Real Estate Development Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the development, construction and sale of real estate properties |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Shanghai Ding Qi Property Management Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the management of real estate properties |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Advanced Semiconductor Engineering (HK) Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the trading of substrates |
Establishment and Operating Location |  | Hong Kong |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Shanghai Ding Wei Real Estate Development Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the development, construction and leasing of real estate properties |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Shanghai Ding Yu Real Estate Development Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the development, construction and leasing of real estate properties |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Shanghai Ding Fan Department Store Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in department store business |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Kun Shan Ding Hong Real Estate Development Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the development, construction and leasing of real estate properties |
Establishment and Operating Location |  | Kun Shan, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Shanghai Ding Xu Property Management Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the management of real estate properties |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Electronics Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the production of substrates |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Test Holdings, Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Cayman Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Holdings (Singapore) Pte. Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Singapore |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Singapore Pte. Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Singapore |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ISE Labs, Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the testing of semiconductors |
Establishment and Operating Location |  | U.S.A. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Electronics (M) Sdn. Bhd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Malaysia |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ASE Assembly & Test (Shanghai) Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
ISE Labs, China, Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the testing of semiconductors, and was established in October 2018 |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Wuxi Tongzhi Microelectronics Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Wuxi, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
USIINC [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in investing activity |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
USI Global [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Merged by the Company in January 2019 |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  |  | 100.00%
Huntington Holdings International Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Unitech Holdings International Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Real Tech Holdings Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Universal ABIT Holding Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | In the process of liquidation |
Establishment and Operating Location |  | British Cayman Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Rising Capital Investments Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Liquidated in November 2019 |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  |  | 100.00%
Rise Accord Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Liquidated in December 2019 |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  |  | 100.00%
Universal Scientific Industrial (Kunshan) Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the manufacturing and sale of computer assistance system and related peripherals |
Establishment and Operating Location |  | Kun Shan, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%
USI Enterprise Limited ("USIE") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the services of investment advisory and warehousing management |
Establishment and Operating Location |  | Hong Kong |
Percentage of Ownership (%) |  | 95.80% | 95.40%
Universal Scientific Industrial (Shanghai) Co., Ltd. ("USISH") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the designing, manufacturing and sale of electronic components |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Global Technology Co., Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Holding company |
Establishment and Operating Location |  | Hong Kong |
Percentage of Ownership (%) | 42.23% | 75.30% | 74.60%
Universal Global Technology (Kunshan) Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the designing and manufacturing of electronic components |
Establishment and Operating Location |  | Kun Shan, China |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Global Technology (Shanghai) Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the processing and sales of computer and communication peripherals as well as business in import and export of goods and technology |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Global Electronics (Shanghai) Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the sale of electronic components and telecommunications equipment |
Establishment and Operating Location |  | Shanghai, China |
Percentage of Ownership (%) |  | 75.30% | 74.60%
USI America Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the manufacturing and processing of motherboards and wireless network communication and provision of related technical service |
Establishment and Operating Location |  | U.S.A. |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Global Industrial Co., Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in manufacturing, trading and investing activity |
Establishment and Operating Location |  | Hong Kong |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Global Scientific Industrial Co., Ltd. ("UGTW") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the manufacturing of components of telecomm and cars and provision of related R&D services |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Scientific Industrial De Mexico S.A. De C.V. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the assembling of motherboards and computer components |
Establishment and Operating Location |  | Mexico |
Percentage of Ownership (%) |  | 75.30% | 74.60%
USI Japan Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the manufacturing and sale of computer peripherals, integrated chip and other related accessories |
Establishment and Operating Location |  | Japan |
Percentage of Ownership (%) |  | 75.30% | 74.60%
USI Electronics (Shenzhen) Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the design, manufacturing and sale of motherboards and computer peripherals |
Establishment and Operating Location |  | Shenzhen, China |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Global Electronics Co., Ltd [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in accepting and outsourcing orders as well as sales of electronic components and service of technical advisory, and was established in February 2018 |
Establishment and Operating Location |  | Hong Kong |
Percentage of Ownership (%) |  | 75.30% | 74.60%
Universal Scientific Industrial Co., Ltd. ("USI") [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the manufacturing, processing and sale of computers, computer peripherals and related accessories |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 75.30% | 74.40%
Semicondutores Avancados do Brasil S.A. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the research and manufacturing of multi-functional system-in-package products, and was established in March 2019 and then invested in May 2019 |
Establishment and Operating Location |  | Brasil |
Percentage of Ownership (%) |  | 56.50% |
Huanrong Electronics (Huizhou) Co., Ltd. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the research and manufacturing of new electronic applications, communications, computers and other electronics products and also provided auxiliary technical services as well as import and export services, and was established in April 2019 and then invested in May 2019 |
Establishment and Operating Location |  | Huizhou, China |
Percentage of Ownership (%) |  | 75.30% |
Universal Scientific Industrial (France) ("USIFR") [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in investing activities and was established in August 2019 |
Establishment and Operating Location |  | France |
Percentage of Ownership (%) |  | 75.30% |
Chung Hong Electronics Poland Sp. z o.o. ("UGPL") [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the assembly, testing and turnkey services of integrated circuits |
Establishment and Operating Location |  | Poland |
Percentage of Ownership (%) |  | 45.20% |
SPIL [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the assembly, testing and turnkey services of integrated circuits |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
SPIL (B.V.I.) Holding Limited [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in investing activities |
Establishment and Operating Location |  | British Virgin Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Siliconware Investment Co., Ltd. [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in investing activities |
Establishment and Operating Location |  | R.O.C. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Siliconware USA Inc [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in marketing activities |
Establishment and Operating Location |  | U.S.A. |
Percentage of Ownership (%) |  | 100.00% | 100.00%
SPIL Cayman Holding Limited [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in investing activities |
Establishment and Operating Location |  | British Cayman Islands |
Percentage of Ownership (%) |  | 100.00% | 100.00%
Siliconware Technology (Suzhou) Limited ("SZ") [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Suzhou, China |
Percentage of Ownership (%) |  | 100.00% | 70.00%
Siliconware Electronics (Fujian) Co., Limited [Member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Main Business |  | Engaged in the packaging and testing of semiconductors |
Establishment and Operating Location |  | Fujian, China |
Percentage of Ownership (%) |  | 100.00% | 100.00%

X
- Definition The description of the nature of the entity's operations and principal activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 138 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_138_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The principal place of business of a subsidiary. [Refer: Principal place of business; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_ii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_ii&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 12 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_12_b&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 19B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_19B_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_PrincipalPlaceOfBusinessOfSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AdvancedSemiconductorEngineeringIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEHoldingLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_JAndRHoldingLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_InnosourceLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_OmniquestIndustrialLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEMarketingAndServiceJapanCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASETestIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_LuchuDevelopmentCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_TLJIntertechIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_MingfengInformationServiceCorpLtdmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AseEmbeddedElectronicsIncAseeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AdvancedMicroelectronicProductsIncAmpiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AltoEnterprisesLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SuperZoneHoldingsLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEKunShanIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEInvestmentKunShanLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AdvancedSemiconductorEngineeringChinaLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEInvestmentLabuanIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASETestLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEJapanCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEUSIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_GlobalAdvancedPackagingTechnologyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEWeiHaiIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SuzhouASENSemiconductorsCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AnstockLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AnstockIILimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEShanghaiIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASECorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEMauritiusIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASELabuanIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ShanghaiDingHuiRealEstateDevelopmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ShanghaiDingQiPropertyManagementCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_AdvancedSemiconductorEngineeringHKLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ShanghaiDingWeiRealEstateDevelopmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ShanghaiDingYuRealEstateDevelopmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ShanghaiDingFanDepartmentStoreCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_KunShanDingHongRealEstateDevelopmentCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ShanghaiDingXuPropertyManagementCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEElectronicsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASETestHoldingsLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEHoldingsSingaporePteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASESingaporePteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ISELabsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEElectronicsMSdnBhdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ASEAssemblyAndTestShanghaiLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ISELabsChinaLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_WuxiTongzhiMicroelectronicsCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_USINCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UsiGlobalmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_HuntingtonHoldingsInternationalCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UnitechHoldingsInternationalCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_RealTechHoldingsLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalABITHoldingCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_RisingCapitalInvestmentsLimitedmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_RiseAccordLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalScientificIndustrialKunshanCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_USIEnterpriseLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalScientificIndustrialShanghaiCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalGlobalTechnologyCoLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalGlobalTechnologyKunshanCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalGlobalTechnologyShanghaiCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalGlobalElectronicsShanghaiCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_USIAmericaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalGlobalIndustrialCoLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalGlobalScientificIndustrialCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalScientificIndustrialDeMexicoSADeCVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_USIJapanCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_USIElectronicsShenzhenCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalGlobalElectronicsCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalScientificIndustrialCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SemicondutoresAvancadosDoBrasilSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_HuanrongElectronicshuizhouCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_UniversalScientificIndustrialfranceusifrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_ChungHongElectronicsPolandSpZOougplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SpilOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SpilbviHoldingLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SiliconwareInvestmentCoLtdOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SiliconwareUsaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SpilcaymanHoldingLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SiliconwareTechnologysuzhouLimitedszMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=asx_SiliconwareElectronicsfujianCoLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |