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Retirement Benefit Plans - Pension Costs of Defined Benefit Plans Recognized in Profit or Loss by Categories (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement $ 281.4 $ 208.6 $ 192.5
Cost of revenue [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement 182.3 135.1 124.5
Research and development expenses [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement 76.1 55.6 52.8
General and administrative expenses [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement 19.3 15.1 12.5
Marketing expenses [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement $ 3.7 $ 2.8 $ 2.7