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Retirement Benefit Plans - Summary of Maturity Analysis of Undiscounted Pension Benefit (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of defined benefit plans [line items]      
Maturity analysis of undiscounted pension benefit $ 13,127,807 $ 400,360 $ 13,559,921
Less than 1 year [member]      
Disclosure of defined benefit plans [line items]      
Maturity analysis of undiscounted pension benefit 677,634 20,666 699,372
1-5 years [member]      
Disclosure of defined benefit plans [line items]      
Maturity analysis of undiscounted pension benefit 2,870,872 87,553 2,814,648
More than 5 years [member]      
Disclosure of defined benefit plans [line items]      
Maturity analysis of undiscounted pension benefit $ 9,579,301 $ 292,141 $ 10,045,901