v3.26.1
Other Intangible Assets - Summary of Carrying Amounts of Each Class of Other Intangible Assets (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 detailed information about intangible assets [line items]        
Beginning balance $ 15,692,350      
Amortization expense 3,832,762 $ 122,179 $ 3,820,014 $ 3,906,483
Ending balance 12,920,602 411,878 15,692,350  
Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 41,955,636 1,337,445 40,457,546 40,825,968
Additions 1,118,794 35,664 1,670,252 527,786
Disposals or derecognition (1,111,831) (35,443) (335,661) (936,920)
Acquisitions through business combinations (Note 29)     39,828  
Effect of foreign currency exchange differences 122,943 3,920 123,671 40,712
Ending balance 42,085,542 1,341,586 41,955,636 40,457,546
Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 26,263,286 837,210 22,637,413 19,648,260
Amortization expense 3,832,762 122,179 3,820,014 3,906,483
Disposals or derecognition (1,085,427) (34,601) (328,214) (923,567)
Impairment losses recognized 94,972 3,028    
Acquisitions through business combinations (Note 29)     38,515  
Effect of foreign currency exchange differences 59,347 1,892 95,558 6,237
Ending balance 29,164,940 929,708 26,263,286 22,637,413
Customer relationships [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 4,904,110      
Ending balance 3,900,270 124,331 4,904,110  
Customer relationships [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 11,765,512 375,056 11,762,561 11,736,181
Effect of foreign currency exchange differences 64,502 2,056 2,951 26,380
Ending balance 11,830,014 377,112 11,765,512 11,762,561
Customer relationships [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 6,861,402 218,725 5,812,938 4,761,816
Amortization expense 1,049,397 33,452 1,048,694 1,047,282
Effect of foreign currency exchange differences 18,945 604 (230) 3,840
Ending balance 7,929,744 252,781 6,861,402 5,812,938
Computer software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 2,612,829      
Ending balance 2,744,759 87,497 2,612,829  
Computer software [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 8,693,626 277,132 7,260,393 7,616,109
Additions 1,061,070 33,824 1,597,759 537,261
Disposals or derecognition (448,249) (14,289) (325,476) (905,947)
Acquisitions through business combinations (Note 29)     39,828  
Effect of foreign currency exchange differences 59,150 1,886 121,122 12,970
Ending balance 9,365,597 298,553 8,693,626 7,260,393
Computer software [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 6,080,797 193,841 5,381,884 5,305,294
Amortization expense 892,552 28,452 886,727 970,413
Disposals or derecognition (428,785) (13,669) (319,368) (894,767)
Impairment losses recognized 37,358 1,191    
Acquisitions through business combinations (Note 29)     38,515  
Effect of foreign currency exchange differences 38,916 1,241 93,039 944
Ending balance 6,620,838 211,056 6,080,797 5,381,884
Patents and acquired specific technology [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 8,069,574      
Ending balance 6,139,842 195,723 8,069,574  
Patents and acquired specific technology [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 21,311,500 679,359 21,317,895 21,317,352
Additions       1,350
Disposals or derecognition (595,143) (18,972) (8,846)  
Effect of foreign currency exchange differences (969) (30) 2,451 (807)
Ending balance 20,715,388 660,357 21,311,500 21,317,895
Patents and acquired specific technology [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 13,241,926 422,121 11,369,356 9,488,185
Amortization expense 1,872,118 59,679 1,878,965 1,881,980
Disposals or derecognition (595,143) (18,972) (8,846)  
Impairment losses recognized 57,614 1,837    
Effect of foreign currency exchange differences (969) (31) 2,451 (809)
Ending balance 14,575,546 464,634 13,241,926 11,369,356
Others [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 105,837      
Ending balance 135,731 4,327 105,837  
Others [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 184,998 5,898 116,697 156,326
Additions 57,724 1,840 72,493 (10,825)
Disposals or derecognition (68,439) (2,182) (1,339) (30,973)
Effect of foreign currency exchange differences 260 8 (2,853) 2,169
Ending balance 174,543 5,564 184,998 116,697
Others [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 79,161 2,523 73,235 92,965
Amortization expense 18,695 596 5,628 6,808
Disposals or derecognition (61,499) (1,960)   (28,800)
Effect of foreign currency exchange differences 2,455 78 298 2,262
Ending balance $ 38,812 $ 1,237 $ 79,161 $ 73,235