v3.26.1
Operating Segments Information - Summary of Revenue from Major Products and Services (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
TWD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Disclosure of products and services [line items]        
Operating revenue $ 645,387,710 $ 20,573,405 $ 595,409,585 $ 581,914,471
Packaging service [member]        
Disclosure of products and services [line items]        
Operating revenue 308,342,594 9,829,219 261,731,413 256,805,887
Testing service [member]        
Disclosure of products and services [line items]        
Operating revenue 71,900,228 2,292,006 54,561,480 49,879,923
EMS [member]        
Disclosure of products and services [line items]        
Operating revenue 257,192,747 8,198,685 271,293,309 268,218,002
Other products and services [member]        
Disclosure of products and services [line items]        
Operating revenue $ 7,952,141 $ 253,495 $ 7,823,383 $ 7,010,659