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 |