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Borrowings - Summary of Bills Payable (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | $ 11,997,753 | $ 390,425 | $ 8,498,647
Unamortized Discounts [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 2,247 | 73 | 1,353
Longterm Bills Payable [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 12,000,000 | 390,498 | 8,500,000
Ta Ching Bills Finance Corporation [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 3,000,000 | 97,625 | 2,500,000
Cathay United Bank [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 9,000,000 | 292,873 | 0
Mega Bills Finance Corporation [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 0 | 0 | 2,000,000
China Bills Finance Corporation [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 0 | 0 | 2,500,000
International Bills Finance Corporation [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | $ 0 | $ 0 | $ 1,500,000

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