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Effects of initial application of IFRS 15 - Additional Information (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Jan. 01, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Jan. 01, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of initial application of standards or interpretations [line items]              
Retained earnings $ 5,401,569 $ 192,364 $ 4,651,215        
Inventories 2,102,075 74,860 1,767,642        
Contract assets 389,016   377,869 $ 299,835      
Provision for sales allowance 3,463 123 1,998        
Deferred tax assets 185,691 6,613 194,552   $ 226,716   $ 212,372
Deferred tax liabilities $ 310,427 $ 11,055 $ 309,129   $ 308,759   $ 174,293
Increase (decrease) due to application of IFRS 15 [member]              
Disclosure of initial application of standards or interpretations [line items]              
Retained earnings           $ (8,693)  
Provision for sales allowance           70,156  
Deferred tax assets           (626)  
Deferred tax liabilities           8,067  
Increase (decrease) due to application of IFRS 15 [member] | Customized products [member]              
Disclosure of initial application of standards or interpretations [line items]              
Retained earnings           46,607  
Inventories           (208,505)  
Contract assets           $ 255,112