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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%