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Borrowings - Summary of Bank Loans (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Less: current portion $ 5,041,841 $ 164,069 $ 4,526,683
Noncurrent portion 94,947,610 3,089,737 117,164,876
Bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 87,991,698 2,863,381 117,973,843
Less: current portion 5,041,841 164,069 4,526,683
Financial liabilities for hedging - non-current 0 0 4,780,931
Noncurrent portion 82,949,857 2,699,312 108,666,229
Bank loans [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 87,991,698 2,863,381 117,977,485
Bank loans [member] | Cost [member] | Syndicated bank loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 0 0 2,562,926
Bank loans [member] | Cost [member] | Other loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 79,657,893 2,592,187 107,383,417
Bank loans [member] | Cost [member] | Mortgage loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 8,333,805 271,194 8,031,142
Bank loans [member] | Net Unamortized Debt Issue Costs [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings $ 0 $ 0 $ 3,642