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Business Combinations - Summary of Identification of the Difference Between the Cost of the Investment and the Group's Share of FAFG's Net Fair Value Of Identifiable Assets And Liabilities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Trade receivables, net $ 106,887,312 $ 3,259,754 $ 93,899,276      
Inventories 57,313,938 1,747,909 59,658,354      
Property, plant and equipment 312,531,471 9,531,304 264,871,522      
Goodwill 52,525,342 1,601,871 52,419,427 $ 1,598,641 $ 52,313,399 $ 52,072,413
Other payables 12,428,194 379,024 12,223,879      
Deferred tax liabilities 6,850,104 208,908 7,703,646      
Net defined benefit liabilities $ 2,869,587 $ 87,514 3,584,736 $ 109,324 $ 3,784,120 $ 5,561,596
After Retrospectively Adjusted [Member]            
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Trade receivables, net     99,536,761      
Other receivables     15,902,053      
Current tax assets     875,598      
Inventories     59,658,354      
Other current assets     4,973,647      
Property, plant and equipment     264,871,522      
Goodwill     52,419,427      
Other payables     44,556,840      
Current tax liabilities     9,649,556      
Deferred tax liabilities     7,703,646      
Net defined benefit liabilities     4,130,104      
Before Retrospectively Adjusted [Member]            
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Trade receivables, net     99,529,100      
Other receivables     15,611,917      
Current tax assets     905,345      
Inventories     59,606,188      
Other current assets     4,959,034      
Property, plant and equipment     264,812,022      
Goodwill     52,404,416      
Other payables     44,242,885      
Current tax liabilities     9,667,755      
Deferred tax liabilities     7,598,008      
Net defined benefit liabilities     $ 4,122,158