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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement $ 208.6 $ 192.5 $ 204.9
Cost of revenue [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement 135.1 124.5 126.3
Research and development expenses [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement 55.6 52.8 57.3
General and administrative expenses [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement 15.1 12.5 18.2
Marketing expenses [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit cost recognized in the income statement $ 2.8 $ 2.7 $ 3.1