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Contents of Significant Accounts - Financial Liabilities at Fair Value through Profit or Loss, Current (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Current Financial Liabilities At Fair Value Through Profit Or Loss [Line Items]      
Financial liabilities at fair value through profit or loss, current $ 901,000 $ 27,478 $ 1,019,362
Embedded derivatives in exchangeable bonds [Member]      
Current Financial Liabilities At Fair Value Through Profit Or Loss [Line Items]      
Financial liabilities at fair value through profit or loss, current 899,961   1,019,362
Forward exchange contracts [member]      
Current Financial Liabilities At Fair Value Through Profit Or Loss [Line Items]      
Financial liabilities at fair value through profit or loss, current $ 1,039   $ 0