v3.26.1
Business Combinations - Summary of Net Cash Outflow on Acquisition of Subsidiary (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about business combination [Line Items]    
Less: Cash and cash equivalents acquired   $ (261,238)
Net cash outflow on acquisition of subsidiaries   $ 2,354,938
HIRSCHMANN [member]    
Disclosure of detailed information about business combination [Line Items]    
Consideration paid in Cash $ 2,317,201  
Less: Cash and cash equivalents acquired (118,419)  
Net cash outflow on acquisition of subsidiaries 2,198,782  
ASEPCAYMAN [Member]    
Disclosure of detailed information about business combination [Line Items]    
Consideration paid in Cash 725,059  
Less: Cash and cash equivalents acquired (404,573)  
Net cash outflow on acquisition of subsidiaries 320,486  
CHE [Member]    
Disclosure of detailed information about business combination [Line Items]    
Consideration paid in Cash 1,713,092  
Less: Cash and cash equivalents acquired (1,381,103)  
Net cash outflow on acquisition of subsidiaries $ 331,989