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Accounts receivable - Summary of Accounts and notes receivable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Jan. 01, 2020
TWD ($)
Disclosure of financial assets [Line Items]        
Accounts receivable $ 6,344,246 $ 228,704 $ 5,364,156  
Accounts receivable [member]        
Disclosure of financial assets [Line Items]        
Accounts receivable 6,346,156   5,365,776 $ 4,452,904
Loss allowance [member]        
Disclosure of financial assets [Line Items]        
Accounts receivable $ (1,910)   $ (1,620)