Retirement Benefit Plans - Summary of Maturity Analysis of Undiscounted Pension Benefit (Detail) $ in Thousands, $ in Thousands |
Dec. 31, 2023
TWD ($)
|
Dec. 31, 2023
USD ($)
|
Dec. 31, 2022
TWD ($)
|
|---|---|---|---|
| Disclosure of defined benefit plans [line items] | |||
| Maturity analysis of undiscounted pension benefit | $ 13,416,843 | $ 438,173 | $ 13,337,318 |
| Less than 1 year [member] | |||
| Disclosure of defined benefit plans [line items] | |||
| Maturity analysis of undiscounted pension benefit | 675,526 | 22,062 | 646,243 |
| 1-5 years [member] | |||
| Disclosure of defined benefit plans [line items] | |||
| Maturity analysis of undiscounted pension benefit | 2,719,262 | 88,807 | 2,760,990 |
| More than 5 years [member] | |||
| Disclosure of defined benefit plans [line items] | |||
| Maturity analysis of undiscounted pension benefit | $ 10,022,055 | $ 327,304 | $ 9,930,085 |