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Borrowings - Summary of Short Term Borrowings (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Less: financial liabilities for hedging - current $ (6,716,965) $ (242,140) $ (5,277,325)
Short-term borrowings 34,319,464 1,237,183 31,290,839
Short Term Bank Loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Secured bank loans, annual interest rates both were 0.90%-1.87% as of December 31, 2020 and 2021 203,127 7,322 300,495
Unsecured bank loans, annual interest rates were 0.58%-3.38% and 0.40%-3.75% as of December 31, 2020 and 2021, respectively 40,833,302 1,472,001 34,297,362
Borrowings 41,036,429 1,479,323 34,597,857
Less: financial liabilities for hedging - current 6,716,965 242,140 3,307,018
Short-term borrowings $ 34,319,464 $ 1,237,183 $ 31,290,839