Financial Instruments - Summary of Detailed Information About Hedges (Detail) $ in Thousands, $ in Thousands |
Dec. 31, 2025
TWD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
TWD ($)
|
|---|---|---|---|
| Disclosure of detailed information about hedges [line items] | |||
| Financial liabilities for hedging - current | $ 9,282,400 | $ 295,901 | $ 12,456,104 |
| Fair value hedge of borrowings denominated in foreign currencies [member] | |||
| Disclosure of detailed information about hedges [line items] | |||
| Financial asset for hedging - current | 0 | 0 | 0 |
| Financial liabilities for hedging - current | 843,838 | 26,900 | 3,515,265 |
| Hedges of net investment in foreign operations [member] | |||
| Disclosure of detailed information about hedges [line items] | |||
| Financial asset for hedging - current | 0 | 0 | 0 |
| Financial liabilities for hedging - current | $ 8,438,562 | $ 269,001 | $ 8,940,839 |