v3.26.1
Income Tax - Summary of Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
TWD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Current income tax        
In respect of the current year $ 11,426,102 $ 364,237 $ 9,812,221 $ 10,117,252
Income tax on unappropriated earnings 760,689 24,249 250,421 (3,449,958)
Changes in estimate for prior years 176,837 5,637 (453,274) (67,074)
Current income tax 12,363,628 394,123 9,609,368 6,600,220
Deferred income tax        
In respect of the current year (2,054,334) (65,487) (1,568,365) (1,352,999)
Changes in tax rates (18,085) (577) (25,229) 2,763
Changes in estimate for prior years (288,947) (9,211) (60,902) 35,465
Effect of foreign currency exchange differences 104,394 3,328 (38,409) 18,514
Deferred income tax (2,256,972) (71,947) (1,692,905) (1,296,257)
Income tax expense recognized in profit or loss $ 10,106,656 $ 322,176 $ 7,916,463 $ 5,303,963