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Equity - Schedule of appropriation of retained earnings (Detail) - TWD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dividends per share $ 5.2 $ 8.8
Legal reserve [member]    
Appropriation of earnings $ 3,232,866 $ 6,001,564
Special reserve [member]    
Appropriation of earnings (167,613) (6,845,501)
Cash dividends [member]    
Appropriation of earnings $ 22,838,947 $ 38,482,083