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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Inventories $ 67,832,981 $ 2,445,313 $ 48,590,434      
Financial assets at fair value through profit or loss - non-current 2,502,834 90,225 2,180,978      
Property, plant and equipment 239,867,550 8,646,992 234,365,397      
Right-of-use assets 10,680,262 385,013 8,741,807      
Goodwill 52,072,413 1,877,160 52,709,053 $ 1,900,110 $ 50,198,436 $ 49,974,446
Deferred tax liabilities 7,590,197 273,619 7,121,027      
Non-controlling interests $ 14,544,415 $ 524,312 15,622,009      
After Retrospectively Adjusted [Member]            
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Inventories     48,590,434      
Financial assets at fair value through profit or loss - non-current     2,180,978      
Property, plant and equipment     234,365,397      
Right-of-use assets     8,741,807      
Goodwill     52,709,053      
Other intangible assets     27,711,771      
Deferred tax liabilities     7,121,027      
Non-controlling interests     15,622,009      
Before Retrospectively Adjusted [Member]            
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]            
Inventories     48,516,459      
Financial assets at fair value through profit or loss - non-current     1,793,188      
Property, plant and equipment     233,207,324      
Right-of-use assets     8,620,612      
Goodwill     54,777,439      
Other intangible assets     26,808,668      
Deferred tax liabilities     6,551,233      
Non-controlling interests     $ 15,616,053