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Other gains and losses - Summary of Other gains and losses (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of Other gains and losses [Abstract]        
Foreign exchange gains, net $ 242,588   $ 78,170 $ 448,097
Gain on disposal of non-current assets held for sale 72,261      
(Loss) gain on valuation of financial assets at fair value through profit or loss 48,101 $ 1,467 39,254 (69,404)
Reimbursement of ADSs service charge 2,611   2,121 2,412
Others 28,004   15,956 5,462
Total $ 393,565 $ 12,003 $ 135,501 $ 386,567