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Income Tax - Summary of Unused Investment Credits (Detail) - 12 months ended Dec. 31, 2022
$ in Thousands, $ in Thousands
TWD ($)
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Remaining Creditable Amount $ 2,044,771 $ 66,540
Unused tax credits [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Remaining Creditable Amount $ 953,059 31,014
Purchase of machinery and equipment [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Expiry Year 2023 and thereafter  
Purchase of machinery and equipment [member] | Unused tax credits [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Remaining Creditable Amount $ 841,658 27,389
Others [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Expiry Year 2024 and thereafter  
Others [member] | Unused tax credits [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Remaining Creditable Amount $ 111,401 $ 3,625