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Borrowings - Summary of Bills Payable (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]      
Long-term bills payable $ 8,498,647 $ 306,368 $ 4,998,502
Unamortized Discounts [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 1,353 49 1,498
Longterm Bills Payable [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 8,500,000 306,417 5,000,000
Ta Ching Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 2,500,000 90,123 1,000,000
Mega Bills Finance Corporation [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 2,000,000 72,098 2,000,000
China Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 2,500,000 90,123 $ 2,000,000
International Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable $ 1,500,000 $ 54,073